CN100552648C - Dynamic management method for portable storage device - Google Patents

Abstract

The invention relates to a dynamic management method of a portable storage device, the portable storage device comprises a flash memory for planning a reserved area and a data area, the reserved area comprises a plurality of active blocks for accessing and replacing damaged blocks, the method comprises the following steps: providing a flag for setting to determine the access status of the data area; opening the data area for access when the flag is set to the first state; and restricting the data area from being accessed when the flag is set to the second state. When the number of the active blocks is larger than zero, setting the mark as a first state for opening the data area for access, when the number of the active blocks is equal to zero, setting the mark as a second state for limiting the data area to be accessed, reading the mark before the data area is accessed, and determining to open or limit the data area to be accessed according to the mark state; and detecting whether the number of the active blocks is zero after the data area is accessed, if so, setting the mark to be in a second state, thereby endowing the portable storage device with a more flexible access function and achieving the effect of dynamic management.

Description

Dynamic management method of portable storage device

technical field

The present invention relates to a portable storage device, in particular to a dynamic management of a portable storage device that can be automatically set or passively set by the user, and can flexibly change the access function and achieve dynamic management. method.

Background technique

In recent years, the concept of "carry data with you" has become more and more popular, making various portable storage devices, such as USB flash drives, MP3, CD or DVD discs, various memory cards and hard drives, etc. The most commonly purchased and used equipment. Among them, the USB flash drive is the most convenient and common.

USB flash drives have bidirectional access functions that can be read and written. Compared with CD and DVD discs, USB flash drives have more writing advantages; USB flash drives can be plugged and played. Compared with various memory cards, USB flash drives It has the advantage of price and convenience of use; the volume of the USB flash drive can be made very small. Compared with the hard disk, the USB flash drive has the advantage of smaller size. Based on the above points, the USB flash drive has become the best portable storage device in the minds of users.

Moreover, as the storage capacity of the portable storage device increases and the price becomes cheaper, the popularity of the portable storage device becomes higher and higher, and the user's dependence on these devices is relatively increased. However, all portable storage devices have a limited lifespan. The larger the storage capacity of the device, the more data the user can store. However, once the life of the device is up, the more data stored in the device, the user The more data is lost. Among these devices, the USB flash drive or MP3 that utilizes flash memory (memory is a storage medium, memory, internal memory, etc., hereinafter all referred to as memory) as a storage medium has the biggest problem.

As far as the hard disk is concerned, before the hard disk is damaged, there will be bad sectors first. Once the hard disk starts to have bad sectors, the user will notice whether the life of the hard disk is approaching, and then save the data in the hard disk. In addition, the bad sectors of the hard disk appear gradually. Even if the user loses data, he will lose part of the data, and will not lose the entire hard disk at once.

However, because the USB flash drive or MP3 uses flash memory as the storage medium, and the flash memory has a limitation on the number of times of writing (write) and deletion (erase), so in order to allow the storage space of the flash memory to be On average, the USB flash drive or MP3 will use a piece of software (software is firmware, hereinafter referred to as software) for memory allocation and management.

Please refer to Figure 1, which is a schematic diagram of the existing traditional flash memory and its planning and management methods. Taking the 128MB flash memory shown in Figure 1 as an example, the software divides the flash memory into 1024 areas Blocks, each block (block) 128K, and these blocks are divided into two areas, the reserved area and the data area. The blocks owned by the data area and the reserved area are fixed. For example, the data area occupies 992 blocks. The reserved area occupies 32 blocks. The reserved area mainly includes active blocks (Free Blocks), damaged blocks (Bad Blocks) and other blocks (Other Blocks). The USB flash drive or MP3 needs to use the active blocks to achieve the purpose of data access, so the active area The number of blocks must be greater than 0, but the damaged block is relative to the active block. If there is one more damaged block, it needs to be replaced by an active block. Blocks increase gradually, so that the active blocks are relatively reduced. Once the number of active blocks is equal to 0, there will be no active blocks in the USB flash drive or MP3 to access (delete or write), and the life of the USB flash drive or MP3 will be short. ends and can no longer be used.

It can be seen that the above-mentioned existing management method of the portable storage device obviously still has inconvenience and defects in the management method and use, and needs to be further improved urgently. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general management method has no suitable method to solve the above-mentioned problems. This is obviously a Issues that relevant industry players are eager to solve. Therefore, how to provide a new dynamic management method for portable storage devices is one of the current important issues and has become a goal that the industry needs to improve.

In view of the defects in the above-mentioned existing management methods of portable storage devices, the inventor actively researches and innovates based on years of rich practical experience and professional knowledge engaged in the design and manufacture of such products, and cooperates with the application of academic theories, in order to create A new dynamic management method of a portable storage device can improve the general existing management method and make it more practical. Through continuous research, design, and after repeated trials and improvements, the present invention with practical value is finally created.

Contents of the invention

The purpose of the present invention is to overcome the defects in the existing management methods of portable storage devices and provide a new dynamic management method for portable storage devices. The technical problem to be solved is to make it automatically set Or it can be passively set by the user, so that the access function of the portable storage device can be changed flexibly, so that it is more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to a dynamic management method of a portable storage device proposed by the present invention, the portable storage device includes a flash memory, and the flash memory includes a data area for storing data, and the data area is composed of multiple data blocks, and the flash memory also includes a reserved area, the reserved area includes a plurality of active blocks for performing access operations and replacing damaged blocks in the data area, the method includes the following steps: ( A), setting a mark, to determine the access status of the data area; (B), checking the mark, if the mark is set to a first state, open the data area for access; (C), If the flag is set to a second state, restrict the data area from being accessed; and (D), when the number of active blocks is greater than zero, set the flag to the first state, when the active area When the number of blocks is equal to zero, the flag is set to the second state.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

A plurality of aforementioned dynamic management methods for portable storage devices, wherein the method further includes step (E): after the data area is accessed, detect whether the number of active blocks is zero, and if so, mark Set to this second state.

The aforementioned dynamic management method of a portable storage device, wherein the method further includes a step (F): before the data area is accessed, read the mark and execute steps (B) and (C).

In the aforementioned dynamic management method for a portable storage device, the method steps are executed by a software program (a software program is a firmware program, hereinafter referred to as a software program) in the portable storage device.

In the aforementioned dynamic management method of a portable storage device, when the flag is in the second state, the data area is restricted to be read only.

In the aforementioned dynamic management method of a portable storage device, when the flag is in the second state, the data area is restricted from being accessed.

The dynamic management method of the aforementioned portable storage device, wherein the method further includes step (G): when the flag is in the second state, the portable storage device can be connected to it through a personal computer (i.e. personal Computers, hereinafter referred to as personal computers) change the state of the flag to change the access restrictions of the data area.

In the aforementioned dynamic management method of a portable storage device, in the step (GD), the personal computer can change the flag from the second state to a third state, so that the data area can only be read Pick.

In the aforementioned dynamic management method of a portable storage device, in the step (G), the personal computer can change the flag from the second state to a fourth state, so that the data area cannot be restricted irreversibly. is accessed.

In the aforementioned dynamic management method of a portable storage device, in the step (GD), the personal computer may further dynamically increase the number of active blocks in the reserved area according to the capacity of the data area of the portable storage device, and change the flag to the first state.

In the aforementioned dynamic management method of a portable storage device, in the step (G), when the personal computer judges that the number of active blocks in the reserved area cannot be increased according to the capacity of the data area, the The flag changes to a third state, restricting the data area to be read only.

The dynamic management method of the aforementioned portable storage device, wherein in the step (G), when the personal computer judges that the number of active blocks in the reserved area can no longer be increased according to the capacity of the data area, it will mark the Changing to a fourth state irreversibly restricts the data area from being accessed.

In the aforementioned dynamic management method of a portable storage device, in the step (G), the personal computer can dynamically increase the number of active blocks in the reserved area according to the capacity of the data area, and change the flag to the first state.

In the aforementioned dynamic management method of a portable storage device, in the step (G), the personal computer can further change the flag to a fourth state, so that the data area cannot be accessed irreversibly.

In the aforementioned dynamic management method for a portable storage device, the mark is recorded in the reserved area.

The dynamic management method of the aforementioned portable storage device, wherein the states of the flags and the corresponding access state of the data area are recorded in a mode flag setting stored in the reserved area of the flash memory surface.

In the aforementioned dynamic management method for a portable storage device, the steps (B) and (C) are realized by a software program preset in the portable storage device.

In the aforementioned dynamic management method of a portable storage device, the step (G) is realized by a software program preset in the personal computer (that is, a software program, hereinafter referred to as a software program).

Compared with the prior art, the present invention has obvious advantages and beneficial effects. From the above, it can be known that the present invention relates to a dynamic management method of a portable storage device. The portable storage device includes a flash memory planned with a reserved area and a data area. The reserved area includes multiple Perform access operation and replace the active block of the damaged block. The method provides a flag. When the number of active blocks is greater than zero, the flag is set to a first state of opening the data area for access. When When the number of active blocks is equal to zero, the flag is set to a second state that restricts the data area from being accessed, and before the data area is accessed, the flag needs to be read to decide to open according to the state of the flag Or restrict access to the data area; and after the data area is accessed, detect whether the number of active blocks is zero, if so, set the flag to the second state, thereby granting portable storage Device more flexible access function.

With the above technical solution, the dynamic management method of the portable storage device of the present invention has at least the following advantages: The advantage of the present invention is that the portable storage device itself or the user can change the mark, Change the access function of the portable storage device to help the portable storage device recover from an abnormal state to a back-up state or a normal state, and allow users to change the mark to prevent others from stealing or modifying the portable storage device The data stored in the device can achieve the purpose and effect of dynamically managing the portable storage device.

In summary, the novel dynamic management method of the portable storage device of the present invention can be set automatically or passively by the user, and can flexibly change the access function of the portable storage device to prevent others from stealing or Modifying the data stored in the portable storage device can achieve the effect of dynamically managing the portable storage device, which is very suitable for practical use. The present invention has many advantages and practical value mentioned above. It has great improvements in both management methods and functions, and has made remarkable progress in technology, and has produced easy-to-use and practical effects, and is more portable than the existing ones. The management method of the type storage device has the prominent function of promotion, thereby is more suitable for practical use, and has the extensive utilization value of industry, is a novel, progressive, practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of an existing traditional flash memory and its planning and management method.

FIG. 2 is a flowchart of a first preferred embodiment of a dynamic management method for a portable storage device of the present invention.

FIG. 3 is a flow chart of the second preferred embodiment of the dynamic management method of the portable storage device of the present invention.

FIG. 4 is a flow chart of flag state setting by the personal computer in the abnormal mode of the portable storage device according to the second embodiment of the present invention.

FIG. 5 is a flow chart of the portable storage device in the backup mode using the personal computer to change the flag state according to the second embodiment of the present invention.

FIG. 6 is a flow chart of the flag state change setting performed by the personal computer in the normal mode of the portable storage device according to the second embodiment of the present invention.

7 is a flow chart of dynamically increasing the capacity of the reserved area of the flash memory of the portable storage device through the personal computer according to the second embodiment of the present invention.

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation and management methods of the dynamic management method for portable storage devices proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. The method, steps, features and effects thereof are described in detail below.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of an embodiment with reference to the drawings.

See also shown in Fig. 2, be the first preferred embodiment of the dynamic management method of portable storage device of the present invention, in this embodiment, this portable storage device is a USB flash drive or MP3, and it mainly includes A first memory unit, a second memory unit and a control chip, wherein the first memory unit is a flash memory (Flash memory), and the second memory unit includes a random access memory (RAM) and A read-only memory (ROM), and a software program for planning and managing the flash memory is loaded in the control chip.

Also taking the 128MB flash memory shown in Figure 1 as an example, the software program cuts the flash memory into 1024 blocks, each block (block) has a capacity of 128K, and divides these blocks into a reserved area There are two areas with a data area. The blocks owned by the data area and the reserved area are fixed. For example, the data area occupies 992 blocks (meaning that the user has 992x128k=124MB of space to access data), and the reserved area occupies 32 blocks. blocks (representing that the software or firmware has 32x128k=4MB of space available). Among them, the reserved area is composed of active blocks (up to 31), damaged blocks (0 initially) and other blocks (1). The USB flash drive or MP3 needs to achieve the purpose of data reading and writing through the active blocks, so The number of active blocks must be greater than 0, but when a block is damaged, it must be replaced by an active block, so the more damaged blocks, the relatively fewer active blocks.

Therefore, in order to know the status of the number of active blocks, the portable storage device can be flexibly and advantageously controlled in a timely manner, so that the user will no longer be unable to operate the portable storage device because the active block is 0. The portable storage device performs data access operations. So as shown in the following table 1, the present embodiment provides a mark for determining the access state of the data area and a mode mark setting table (table 1), when the number of active blocks is greater than 0, the mark is set to a first state (0) that opens the data area for access, and when the number of active blocks is equal to 0, the flag is changed to a second state (1) that restricts the data area from being accessed , that is, when the flag is in the first state (0), the portable storage device is in a normal mode, so that the data area can be read, written and deleted, and when the flag is in the second state (1 ), the portable storage device is in a backup mode, and the restricted data area can only be used for reading data, and cannot be written or deleted.

model flag state Function normal 0 (first state) All access functions (read, write, delete) backup 1 (second state) Only provide read function

Table 1

And the current state of the mark is recorded in other blocks of the reserved area, and all possible states of the mark and their corresponding data area access states are set by the mode flag recorded in other blocks of the reserved area Table (Table 1).

Therefore, according to the mode flag setting table in Table 1 above, when the portable storage device is connected to an external electronic device, such as a personal computer (PC), the software program in the portable storage device will be loaded and executed. And carry out the judgment process as shown in FIG. 2 .

First, as shown in steps 21 and 22 of Figure 2, the program (i.e. the program, hereinafter referred to as the program) reads the mark recorded in the reserved area and temporarily stores it in the random access memory (RAM) of the second memory unit, and Determine whether the state of the flag is in the normal mode (that is, the first state (0))? If so, as in step 23, open the data area for the personal computer to access (including operations such as reading, writing and deleting) according to the setting of the mode flag setting table. And because there may be blocks in the data area damaged during the access process, they need to be replaced by active blocks to reduce the number of active blocks. Therefore, after the access operation is completed, the program will proceed to step 24 to determine whether the number of active blocks is is 0? , if not, then end the judging process, otherwise, it means that there is no active block in the reserved area for writing and deleting, but in order to allow the data in the data area to still be read, therefore, as in step 25, the program will mark Change from the first state (0) to the second state (1), and refer to the mode flag setting table, so that the portable storage device enters a backup mode in which the data area is limited to read but not write.

On the contrary, when judging in step 22 that the state of the mark is not in the normal mode, it means that the mark is in the second state (1), then as in step 26, the portable storage device is made to enter the backup mode, so that the data area can only be accessed read.

And after the process ends, the flag state temporarily stored in the random access memory of the second memory unit is written back into the reserved area of the first memory unit (flash memory).

Therefore, with the above flag and process design, and referring to the mode flag setting table, even if the active blocks in the reserved area have been used up and the personal computer can no longer write data, the state of the flag can be automatically changed by the software program To the backup mode, the user can still back up the data stored in the data area through the read function opened by the portable storage device, thereby avoiding the use of the active block in the memory of the portable storage device. After that, the backup becomes completely inaccessible.

Please refer to Fig. 3 again, it is the second preferred embodiment of the dynamic management method of the portable storage device of the present invention, this embodiment is to pass a software program in the portable storage device and a software on the personal computer end program to achieve. And as shown in the following table 2, like the first embodiment, the present embodiment needs to set up a mode mark setting table (table 2) recorded in the reserved area in advance except adopting the access status of the mark to represent the data area. ), to determine the access state of the data area according to the state of the flag, wherein when the flag is a first state (0), the portable storage device is in a normal mode in which all access functions are open; when the flag is a During the second state (1), the portable storage device is in an abnormal mode that does not provide an access function, and when marked as a third state (2), the portable storage device is in a state that only provides a read function ( backup function), when marked as a fourth state (3), the portable storage device is in a maintenance mode that does not provide access functions and cannot restore functions, and in this embodiment, the portable storage device is limited to The software program in the storage device can only convert the portable storage device from the normal mode to the abnormal mode, and the conversion between other modes needs to be executed by the software program of the external personal computer.

model state Function normal 0 (first state) All access functions (read, write, delete) Abnormal 1 (second state) Does not provide access function, but can reply backup 2 (third state) Only provide access function repair 3 (fourth state) Does not provide access and cannot reply

Table 2

And, similarly, when the portable storage device is connected to the personal computer for access, the software program in the portable storage device is executed and the judgment process shown in Figure 3 is performed, and the program read record is reserved The mark of the zone is temporarily stored in the random access memory (RAM) of the second memory unit, wherein steps 401 to 404 are the same as steps 21 to 24 shown in FIG. 2 of the first embodiment, and the only difference is that when Step 402, when judging that the portable storage device is not in the normal mode according to the status of the flag, go to step 405, judging whether the status of the flag is in the abnormal mode? If so, then proceed to step 406, enter the abnormal mode, do not provide all access functions, but allow the software program of the personal computer to change the flag state, if not, then enter step 407, judge whether the flag state is a backup mode? If yes, go to step 408 to enter the backup mode, provide the reading function, and allow the software program of the personal computer to change the status of the flag. If not, proceed to step 409, enter the maintenance mode, do not provide all access functions, and make the software program of the personal computer unable to change the flag state. In addition, in step 404, when it is judged that the number of active blocks is equal to 0, proceed to step 410, change the flag to the second state (1), and make the portable storage device enter into an abnormal mode that does not provide access function.

Therefore, in the abnormal mode, the portable storage device will not provide any access function, thereby allowing the user to realize the message that the active blocks in the flash memory may be used up. At this time, the user The software program can be executed by the personal computer, and the mode state switching and setting of the portable storage device can be performed.

Please refer to FIG. 4, which is a flow chart of the portable storage device according to the second embodiment of the present invention to set the flag status through the personal computer in the abnormal mode, and please refer to the above table 2. When the portable storage device When the device is connected to the personal computer in abnormal mode, the preset software program in the personal computer is started (automatically or passively), and the following process is performed.

First of all, the program will provide an operation interface (not shown in the figure) on the display screen of the personal computer, then, proceed to step 601, the program inquires and judges whether the user wants to change the flag state, if so, it means that the user has set Decide (input) the flag state that wants to change, then, carry out step 602, judge whether flag changes to the 3rd state (2), if so, then execute step 603, make portable storage device enter the backup that only provides read function mode; otherwise, go to step 604 to determine whether the flag is changed to the fourth state (3)? If so, then execute step 605, so that the portable storage device enters into a maintenance state that does not provide any access function and cannot be restored; Or whether to increase the capacity of the reserved area of the flash memory (that is, to increase the number of active blocks), if so, it means that the portable storage device enters the abnormal mode because the number of active areas is 0.

Therefore, enter step 607, the program detects the current data area capacity of the portable storage device, and dynamically increases the capacity of the reserved area according to the capacity of the data area to increase the number of active blocks, and then, as in step 608, the program determines to increase Was the job for the reserved area capacity successful? If yes, proceed to steps 609 and 610, automatically change the flag to the first state (0), and make the portable storage device return to the normal mode providing all access functions.

On the contrary, when in step 608, when it is found that the operation of increasing the capacity of the reserved area is unsuccessful, it means that the flash memory of the portable storage device has no redundant data area to be used as the reserved area, that is, the portable The storage device can no longer provide the function of writing or deleting, then as in step 611, the program will automatically change the flag to the third state (2), so that the portable storage device can at least return to the backup mode that only provides the read function (step 603). Of course, in step 608, when the program determines that it is unsuccessful, step 611 may not be executed, and the process may be ended directly, so that the portable storage device remains in the abnormal mode.

Going back to step 606, when it is judged that the user does not want to increase the capacity of the reserved area of the flash memory, it means that the portable storage device enters the abnormal mode through artificial setting in the normal mode, rather than the activity of the reserved area. The number of blocks has been equal to 0, so enter step 612, further inquire whether the user will return the portable storage device to the normal mode, if so, then change the flag to the first state, and enter step 610 to make the portable storage device The device returns to normal mode. Otherwise, end the process.

Therefore, through the personal computer, when the portable storage device is abnormal and cannot be accessed, the user can change the flag state of the portable storage device through the personal computer, so that the portable storage device can be restored to be readable. Take backup mode or return to normal mode. Moreover, the user can also set the portable storage device from the normal mode to the abnormal mode through the personal computer, thereby preventing others from stealing or modifying the data stored in the portable storage device.

Then please refer to FIG. 5 , which is a flow chart of the portable storage device according to the second embodiment of the present invention under the backup mode to carry out the flag state change setting through the personal computer, and please refer to the above table 2, when the portable storage device When the removable storage device is connected to the personal computer in the backup mode and the preset software program in the personal computer is started, similar to the flow in FIG. 4 , in step 701, the program first asks and determines whether the user wants to change the flag state? If so, proceed to step 702 to determine whether the flag has changed to the second state (1), if so, to make the portable storage device enter the abnormal mode as in step 703, otherwise, proceed to step 704 to judge whether the flag has changed to the fourth state (3), if so, then as in step 705, make the portable storage device enter the maintenance mode; otherwise, then as in step 706, ask the user whether to increase the capacity of the reserved area, if so, then proceed to steps 707～710 (like the above-mentioned step 507 ~510), try to increase the capacity of the reserved area to restore the portable storage device to the normal mode, otherwise, as in step 711, ask the portable storage device whether to return to the normal mode.

Therefore, through the personal computer, when the portable storage device can only provide the reading function, the user can change the flag state of the portable storage device through the personal computer, so that the portable storage device can enter the abnormal state from the backup mode. mode, maintenance mode or return to normal mode.

Please refer to FIG. 6 again, which is a flow chart of the portable storage device according to the second embodiment of the present invention to set the flag state change setting through the personal computer in the normal mode, and please refer to the above-mentioned Table 2, when it can be When the portable storage device is connected to the personal computer in the normal mode, and the preset application program in the personal computer is activated, as in step 81, the program asks the user whether to change the flag state, if so, then as in step 82, it is judged whether to change the flag to Second state (1), if so, then as in step 83, make the portable storage device enter the abnormal mode, otherwise, as in step 84, judge whether to change the flag to the third state (2), if so, as in step 85, Make the portable storage device enter the backup mode, otherwise, end the process.

Therefore, in the normal mode, the user can change the marked state of the portable storage device to an abnormal mode that does not provide an access function or a backup mode that only provides a read function through a personal computer, thereby preventing a third person from accessing the portable storage device. Portable storage devices access or write data, which can achieve the function of data security.

Moreover, it is worth mentioning that the aforementioned step 607 shown in FIG. 4 or step 707 shown in FIG. 5 can be achieved by the following technical means.

First of all, before the application program of the personal computer executes step 607 or 707, in the read-only memory of the second memory unit of the portable storage device, it is necessary to preset a usage level comparison table as shown in Table 3 below, wherein There are n levels planned from top to bottom. The n levels define the reserved area capacity and the corresponding data area capacity incrementally in the form of arithmetic progression (difference 8). Taking 128Mb flash memory as an example , when n=1 (1st level), make the software program plan the flash memory into a reserved area with 32 blocks (128Kb/block) and a data area with 992 blocks, when n=2 , the reserved area has 40 (32+8) blocks, the data area has 984 blocks, and so on. Moreover, the currently used hierarchy of the portable storage device is recorded in other blocks of the reserved area of the flash memory by a tag (Tag).

class Reserved area capacity (number of blocks) Data area capacity (number of blocks) 1 32 992 2 40 984 3 48 976 ... ... ... N 32+8(n-1) 992-8(n-1)

table 3

Therefore, when step 607 or 707 is executed (the data stored in the data area can be backed up first), as shown in FIG. The flow chart of the reserved area capacity of the memory, as shown in the flow chart of Figure 7, the software program proceeds to step 101, first reads the label representing the current level in the reserved area, and as in step 102, judges whether the label has reached the usage level comparison table If it is the last level defined in , if so, return a message that cannot be advanced and end the process, otherwise, as in step 103, add 1 to the tag value, and as in step 104, make the management flash memory of the portable storage device After readjusting the number of blocks in the reserved area and the data area according to the definition in the hierarchical comparison table, the software program re-formats the flash memory as in step 105, and then completes the addition of reserved area capacity (ie, active blocks) homework.

To sum up, the present invention utilizes the design of the above flags and judgment process, and refers to the mode flag setting table, so that the portable storage device has run out of active blocks in the reserved area and cannot allow the personal computer to access data. Under this condition, the marked state can be automatically changed to the backup mode, so that the user can back up the data stored in the data area; in addition, the present invention allows the user to save data in the portable storage by means of an application program preset on the personal computer. When the device is abnormal and cannot be accessed, the flag state of the portable storage device can be changed through the personal computer, so that the portable storage device can return to the backup mode or return to the normal mode, and the user can use personal The computer sets the portable storage device from the normal mode to the abnormal mode, which can prevent others from stealing or modifying the data stored in the portable storage device, and achieves the purpose and effect of dynamic management of the portable storage device.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, the Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (18)

1, a kind of dynamic management approach of portable memory device, this portable memory device comprises a fast flash memory bank, this fast flash memory bank comprises an information data area that Gong stores data, this information data area is made up of a plurality of data blocks, and this fast flash memory bank also comprises a reserved area, this reserved area comprises the active block that a plurality of confessions are carried out access operation and replaced the bad block of this information data area, it is characterized in that this method may further comprise the steps:

(A), set a mark, to determine the access status of this information data area;

(B), check this mark, if this mark is set to one first state, open this information data area is for access;

(C), if this mark be set to one second state, limit this information data area by access; And

(D), when this active block quantity greater than zero the time, be this first state with this flag settings, when this active block quantity equals zero, be this second state with this flag settings.

2, the dynamic management approach of portable memory device according to claim 1, it is characterized in that wherein this method more comprises step (E): after this information data area is by access, whether be zero, if be this second state with this flag settings if detecting this active block quantity.

3, the dynamic management approach of portable memory device according to claim 1 is characterized in that wherein this method more comprises step (F): before this information data area is by access, and this mark of interpretation and execution in step (B) and step (C).

4,, it is characterized in that wherein these method steps are performed by the software program in this portable memory device according to the dynamic management approach of the described portable memory device of arbitrary claim in the claim 1 to 3.

5, the dynamic management approach of portable memory device according to claim 1 is characterized in that wherein being to limit this information data area can only be read when this mark is this second state.

6, the dynamic management approach of portable memory device according to claim 1 is characterized in that wherein when this mark is this second state, be limit this information data area can not be by access.

7, the dynamic management approach of portable memory device according to claim 6, it is characterized in that wherein this method more comprises step (G): when this mark is this second state, this portable memory device can change the state of this mark by a connected personal computer, to change the limited-access of this information data area.

8, the dynamic management approach of portable memory device according to claim 7 is characterized in that in the wherein said step (G), and this personal computer can only be read to limit this information data area with this mark by this second Status Change to a third state.

9, the dynamic management approach of portable memory device according to claim 7, it is characterized in that in the wherein said step (G), this personal computer can be with this mark by this second Status Change to a four condition, make can't limit this information data area with replying can not be by access.

10, the dynamic management approach of portable memory device according to claim 7, it is characterized in that in the wherein said step (G), this personal computer more can be according to the information data area capacity of this portable memory device, dynamically increase the active block quantity of this reserved area, and this mark is changed to this first state.

11, the dynamic management approach of portable memory device according to claim 10, it is characterized in that in the wherein said step (G), when this personal computer according to this information data area capacity, when judgement can't increase the active block quantity of this reserved area again, then this mark is changed to a third state, limiting this information data area can only be read.

12, according to the dynamic management approach of the described portable memory device of claim 1Q, it is characterized in that in the wherein said step (G), when this personal computer can't increase the active block quantity of this reserved area again according to this information data area capacity judgement, then this mark is changed to a four condition, make can't limit this information data area with replying can not be by access.

13, the dynamic management approach of portable memory device according to claim 8, it is characterized in that in the wherein said step (G), this personal computer more can dynamically increase the active block quantity of this reserved area according to this information data area capacity, and this mark is changed to this first state.

14, the dynamic management approach of portable memory device according to claim 8, it is characterized in that in the wherein said step (G), this personal computer more can change to this mark one four condition, make can't limit this information data area with replying can not be by access.

15, the dynamic management approach of portable memory device according to claim 1 is characterized in that wherein said this mark is recorded in this reserved area.

16, the dynamic management approach of portable memory device according to claim 1, it is characterized in that wherein said these flag states and pairing information data area access status thereof, be recorded in a mode flag setting table that is stored in the reserved area of this fast flash memory bank.

17, the dynamic management approach of portable memory device according to claim 1 is characterized in that wherein said step (B) and step (C) are to be realized by a software program that is preset in this portable memory device.

18,, it is characterized in that wherein said step (G) is to be realized by a software program that is preset in this personal computer according to the dynamic management approach of the described portable memory device of arbitrary claim in the claim 7 to 14.

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