CN100458932C - Learning type write strategy adjusting method and device - Google Patents

Abstract

The invention provides a learning write strategy adjusting method and a device thereof. The invention can read the write data again and adjust the write strategy of the same type optical disk of the same manufacturer according to the write quality after the write action of the same type optical disk of the same manufacturer is finished, and record the adjusted write strategy in the memory, and write the data by using the adjusted write strategy when the next time the same type optical disk of the same manufacturer executes the write action again. Therefore, the writing quality of the same type of optical discs of the same manufacturer will be better and better as the number of writing operations increases and the writing quality of the writing operations can be maintained consistent.

Description

Method and device for adjusting learning-type writing strategy

technical field

The present invention relates to a method and device for adjusting the write strategy of an optical drive, and in particular to a method and device for adjusting the learn-type write strategy for the same type of optical discs of the same brand.

Background technique

Due to the advancement of technology, the storage capacity of optical discs is constantly increasing, so using optical discs to back up data is actually the most economical way. Generally speaking, when the optical disc drive receives the write command from the host, it starts to receive the write data from the host and record the write data in the optical disc. That is to say, when the optical drive receives the write command and receives and writes all the written data to the optical disc, the whole process can be defined as a write action (Write Action). During the writing operation, the written data will continue to be encoded by the control chip of the optical drive. In the case of a CD disc, the control chip will be encoded into an eight-to-fourteen modulation (Eight to Fourteen Modulation, hereinafter referred to as 8/14 modulation) signal, and in the case of a DVD disc, the control chip will be encoded into an eight-to-sixteen (Eight to Fourteen Modulation) signal. toSixteen Modulation, hereinafter referred to as 8/16 modulation) signal. Generally speaking, the 8/14 or 8/16 modulation signal represents the interlaced information of light and dark (Land and Pit) to be formed on the track of the optical disc, and the individual "bright" and "dark" record lengths are converted It must be between 3T and 11T.

That is to say, during the entire writing process, the optical drive will use higher laser power to focus on the track to form a "dark" part on the track of the optical disc, and use a lower laser power to focus on the track to form a "bright" part. part. The specification of the optical drive will regulate the driving signal of the laser diode to form the "dark" part and the "bright" part on the optical disc. This is what the specification calls the write strategy (Write Strategy).

Please refer to FIG. 1(a) and (b), FIG. 1(a) shows the writing strategy of CD-R disc, and FIG. 1(b) shows the writing strategy of CD-RW. Due to the different dye materials in the data layer of optical discs, for different types of optical discs, the optical drive will use different writing strategies to form "dark" parts 10, 20 on the optical disc (taking the length of 5T and 3T as an example) and "Ming" part 15 (take 4T length as an example). According to the writing strategy of CD-R discs, it can be known that a single pulse whose amplitude is the write power (Pw, Write Power) directly drives the laser diode to form a "dark" part on the CD-R disc. Voltage power (Pb, Bias Power) drives the laser diode to form a "bright" part on the CD-R disc; from the writing strategy of the CD-RW disc, we can use the amplitude as the write power (Pw) and bias Power (Pb, Bias Power) generated by the interaction of multiple pulses to drive the laser diode can form a "dark" part on the CD-RW disc, and the amplitude can be used to drive the laser diode with the erasing power (Pe ErasePower). The "bright" part is formed on the CD-RW disc.

Generally speaking, because the dyes in the data layer of optical discs manufactured by each optical disc manufacturer are not the same, even the same type of optical discs have different writing strategies. For CD-R optical discs, the magnitude of the writing power and the start and end times of the pulse will have a significant impact on the write quality (Write Quality). Therefore, before the optical drive leaves the factory, the research and development personnel must target different Make an extensive experiment with different types of optical discs of various brands, and adjust all the writing strategies of different types of optical discs of various brands and record all writing strategies in the memory of the optical drive, such as non-volatile (Non -volatile) read-only memory or flash memory, so that the writing quality of the optical drive is maintained above the standard.

Taking CD-R discs as an example, developers will use the writing strategy suggested in the specification as a standard writing strategy. The writing strategies corresponding to different brands of CD-R discs are obtained by adjusting the setting of the standard writing strategy, such as adjusting the size of the writing power and the start and end time of the pulse, or the pulse width, Make the adjusted writing strategy applicable to CD-R discs of a certain brand, of course, all types of discs (DVD+R, DVD+RW, DVD-R, DVD-RW, CD- R or CD-RW) have individual standard writing strategies as well as writing strategies for specific types and brands.

That is to say, when the optical disc is inserted into the optical drive, the optical drive will first confirm the type of the optical disc, such as DVD+R, DVD+RW, DVD-R, DVD-RW, CD-R or CD-RW. Furthermore, the manufacturer of the optical disc can be known from the data track of the optical disc, so the control chip of the optical drive can know the writing strategy of the manufacturer’s optical disc from the memory. When the optical drive starts to receive write data and generate 8 After modulating the signal by /14 or 8/16, the laser diode is driven according to this specific writing strategy to generate interlaced light and dark information on the track of the optical disc.

However, due to the limited memory capacity of the optical drive, it is impossible to record the writing strategies of all types of optical discs of all manufacturers in the world. Therefore, only the writing strategies of various types of optical discs produced by major optical disc manufacturers are recorded in the memory of the general optical disc drive, and the standard writing strategies are used to drive the laser diodes for other optical discs that are not recorded. That is to say, when the optical disc is inserted into the optical drive, the optical drive will first confirm the type of the optical disc, such as DVD+R, DVD+RW, DVD-R, DVD-RW, CD-R or CD-RW. Furthermore, the manufacturer of the optical disc can be known from the data track of the optical disc. If there is no corresponding manufacturer's data in the memory, the optical drive will use the standard writing strategy in the memory to drive the laser diode. For example, when the disc type is DVD+R, drive the laser diode with the standard writing strategy of DVD+R disc; or, when the disc type is CD-RW, use CD-RW disc standard write strategy to drive laser diodes. Generally speaking, the writing quality of the writing action completed by using the standard writing strategy is poor, so it often leads to a high error rate when the optical drive reads the burnt optical disc or it cannot be read at all.

Generally speaking, CD stores sell CDs of various brands and types. It is customary for users to purchase a large number of optical discs of a specific type from a specific manufacturer at the same time, for example, one hundred or fifty optical discs of a specific type from a specific manufacturer at the same time. However, when there is no writing strategy for this specific manufacturer-specific disc in the memory of the optical drive, the optical drive will use the standard writing strategy to perform writing operations, so it is likely to cause all optical discs to be written with poor quality Or an unreadable situation occurs.

Please refer to FIG. 2 , which shows a known method for improving writing quality. This flowchart is disclosed in US Patent No. US 6,636,468. First, the optical drive executes Optimum Power Control (OPC) calibration (step 415), and sets the laser power according to the calibration result (step 420), and writes data in the optical disc with the set laser power (step 415). Step 425). The above-mentioned three steps are the steps that must be executed when the conventional optical drive executes the writing operation.

This invention is characterized in that: when the data has not been completely written into the optical disk (step 427), if an indication that the laser power needs to be adjusted again (step 430), then stop writing at the stop point and read the previously written data (step 427). 440); when the writing quality of the previously written data is not good and the laser power needs to be readjusted, the laser power is adjusted according to the writing quality of the previously written data (step 445 and step 455), when the writing of the previously written data When the quality does not need to readjust the laser power, the laser power is not adjusted (step 445); after that, the starting point is searched on the optical disc to rewrite the data (step 450), and continue to write data on the optical disc with the set laser power in (step 425).

The main purpose of the above-mentioned patent is to monitor the laser power at any time during the writing operation (between step 410 and step 429), stop writing data at the stop point when the laser power needs to be readjusted, and read the previously written data According to the writing quality, the laser power is readjusted to obtain a new laser power, after that, the starting point is searched on the optical disc and the writing operation is performed with the updated laser power.

However, in order to achieve the effect of the known invention, the design of the internal control chip of the optical drive must be more complicated. For example, (I) the optical read-write head must stop writing data at the stop point, then drive the optical read-write head to the previous track to read the written data, and readjust the laser power accordingly, and then restart from the starting point The writing operation is continued with the updated laser power, so that the time of the entire writing operation is extended. (II) According to the above invention, there must be "Linkless" or "Seamless Link" between the stop point and the start point, so that the writing data can be continued. However, the CD-ROM The control chip must be precisely controlled to achieve the above effects. When the control chip cannot accurately control the stop point and the start point, it may cause the failure of the writing operation. (III) If the specific optical disk of a specific manufacturer purchased by the user uses a standard writing strategy to perform the writing operation, although the writing quality in the latter part of the track will become better, however, the writing quality in the front part of the track will be lower. Poor, that is to say, all (one hundred or fifty) CDs purchased by the user at the same time cannot keep the writing quality of the entire CD above the standard.

Contents of the invention

The object of the present invention is to provide a learning-type writing strategy adjustment method and device to solve the known problem of uneven writing quality across the entire optical disc.

In order to achieve the above object, the learning type writing strategy adjustment device provided by the present invention is applied to an optical drive to burn an optical disc of a specific manufacturer and a specific type, including:

A control chip, which can start a write operation to receive a write data in response to a write command from a host, and encode the write data to form a modulation signal;

a memory in which at least a first writing strategy can be stored, and the first writing strategy can be applied to the specific types of optical discs of the specific manufacturer; and

An optical read-write head, which can receive a laser drive signal to record a plurality of bright and dark information on the optical disc;

Wherein, when the control chip confirms that the optical disc of the specific manufacturer and the specific type is loaded, the laser driving signal is formed by using the modulation signal and the first writing strategy, and the control chip The light and dark information can be read to generate a second write strategy to be stored in the memory to replace the first write strategy.

The learning-type writing strategy adjustment device, wherein the writing action can be a one-track writing action at a time, a sector-at-a-time writing action, a disc writing action at a time or a packet writing action. Incoming write action.

In the learning-type write strategy adjustment device, the difference between the first write strategy and the second write strategy is a pulse start time, a pulse end time, or a pulse width.

In the learning-type writing strategy adjustment device, the difference between the first writing strategy and the second writing strategy is a writing power, an erasing power, or a bias power.

In the learning-type write strategy adjustment device, the memory is a non-volatile memory.

The learning-type writing strategy adjustment method provided by the present invention is applied to an optical drive to burn an optical disc of a specific manufacturer and a specific type, and includes the following steps:

After the optical drive completes a writing operation using a first writing strategy stored in a memory, reading a writing data;

judging whether the first write strategy needs to be adjusted according to a write quality of the read write data;

When the first writing strategy needs to be adjusted, using the writing quality to generate a second writing strategy; and

The second writing strategy is stored in the memory to replace the first writing strategy.

The learning-type writing strategy adjustment method, wherein the writing action can be a one-track writing action at a time, a one-segment writing action at a time, a disc writing action at a time or a packet writing action. Incoming write action.

In the learning-type write strategy adjustment method, the difference between the first write strategy and the second write strategy is a pulse start time, a pulse end time, or a pulse width.

In the learning-type writing strategy adjustment method, the difference between the first writing strategy and the second writing strategy is a writing power, an erasing power, or a bias power.

In the learning-type write strategy adjustment method, the memory is a non-volatile memory.

In other words, the learning-type write strategy adjustment device of the present invention is applied to an optical drive to burn an optical disc of a specific manufacturer and a specific type, including: a control chip that can start a write in response to a write command from a host The action is used to receive a write data, and encode the write data to form a modulation signal; a memory can store at least a first write strategy, and the first write strategy can be applied to the specific manufacturer and the specific type of these optical discs; and an optical read-write head can receive a laser drive signal to record a plurality of light and dark information on the optical disc; wherein, when the control chip confirms that the specific type of the specific manufacturer is loaded When using the optical disc, the modulation signal and the first writing strategy are used to form the laser driving signal, and after the writing operation is completed, the control chip can read the bright and dark information to generate a first A second write strategy is stored in the memory to replace the first write strategy.

Moreover, the present invention proposes a method for adjusting a learning-type writing strategy, which is applied to an optical drive to burn a specific type of optical disc of a specific manufacturer, including the following steps: when the optical drive uses a first stored in a memory After a write strategy completes a write action, read a write data; judge whether the first write strategy needs to be adjusted according to a write quality of the read write data; when the first write strategy When adjustment is required, a second write strategy is generated using the write quality; and the second write strategy is stored in the memory to replace the first write strategy.

Description of drawings

Figure 1(a) shows the write strategy for CD-R discs.

Figure 1(b) is the writing strategy of CD-RW.

FIG. 2 is a flowchart of a known method for improving writing quality.

FIG. 3 is a flow chart of the method for adjusting the learning writing strategy of the present invention.

Detailed ways

Since the known methods for improving writing quality cannot completely provide consistent writing quality for the entire optical disc, the present invention proposes a learning-based writing strategy adjustment method for the same type of optical discs of the same brand its device.

Please refer to FIG. 3 , which shows a flow chart of the method for adjusting the learning writing strategy of the present invention. When an optical disc is loaded into the optical drive for writing data (step 510), the optical drive first confirms the type and manufacturer of the optical disc, and can find out a first write strategy (step 515) from the optical drive memory; then, the optical drive Perform optimal power control to set the laser power, and write data in the optical disc with the first writing strategy (step 520); when the data writing is completed (step 525), the optical drive reads the previously written data (step 530); judge whether the write strategy needs to be adjusted by the quality of the read data (step 535); when the write strategy does not need to be adjusted, it means that the type of the manufacturer is written with the first write strategy The writing quality of the optical disc is good, so the first writing strategy in the memory does not need to be changed (step 550); when the writing strategy needs to be adjusted, it means that the manufacturer's optical disc of this type is written with the first writing strategy The writing quality of the chip is poor, so a better second writing strategy must be adjusted according to the writing quality (step 540) and the second writing strategy should be recorded in the memory to replace the original first writing strategy. Import policy (step 545).

According to the embodiment of the present invention, assuming that the user purchases a large number of optical discs of the same type from the same manufacturer, there is no corresponding writing strategy in the memory of the optical drive. When performing the writing operation for the first time, the control chip of the optical drive will use the standard writing strategy as the first writing strategy and complete the entire writing operation. After the writing is completed, the control chip of the optical drive can read the previously written data. data and judge whether it is necessary to adjust the writing strategy according to the writing quality, if the first writing strategy needs to be adjusted, adjust a better second writing strategy according to the writing quality and set the second writing strategy Recorded in memory to replace the original first write strategy. Therefore, when this type of optical disc of this manufacturer is put into the optical drive again to execute the writing operation, the optical drive can find out the second write strategy of this type of optical disc of the manufacturer in the memory. Write data. Therefore, the writing quality of this writing operation will be better than that of the previous writing operation. In the same way, when the user puts the optical disc of this manufacturer into the optical drive for the third time and performs the writing operation, the writing quality will be better than the writing quality of the previous writing operation.

That is to say, using the adjustment method of the learning writing strategy of the present invention, the writing quality of the optical disk of the same manufacturer and the same type will become better and better as the number of writing operations increases and the writing quality can be maintained. The writing quality of the input action is consistent.

According to the embodiment of the present invention, in the step of adjusting the writing strategy by using the writing quality, the optical drive can use the previous writing data and writing power to perform the correction of the optimal power control, and record the corrected laser power in memory. Alternatively, the start time, end time, or pulse width of the pulses of the writing strategy are changed according to the arrangement of light and dark information actually recorded on the optical disc. For example, when the "dark" record length read by the optical drive is converted, it is longer than the actual time length. For example, the "dark" information of 4T is theoretically recorded, but the "dark" of 4.2T is actually read. At this time, the pulse width representing the writing strategy must be reduced. Therefore, the control chip of the optical drive can adjust a better writing strategy according to the read writing quality and record it in the memory of the optical drive. When an optical disc of the same manufacturer and the same type performs a writing operation again, the control chip of the optical drive can use the adjusted writing strategy in the memory to perform the writing operation this time.

Furthermore, the writing action of the present invention may include a Track At Once (TAO for short) writing action, a Session At Once (SAO for short) writing action, and a Disc At Once (Disc At Once) writing action. , DAO for short) write action or package write (Package Write) write action.

Of course, the present invention can also be used to adjust the writing strategy of a specific brand and a specific type already recorded in the memory, that is, although there is an optical disc of a specific manufacturer and a specific type in the optical drive, the learning strategy of the present invention is used The adjustment method can also adjust the writing quality, so that the adjusted writing quality is better.

Since the present invention does not need to stop and start again during the writing operation, the complex design in the control chip can be omitted, and the writing time can be greatly reduced. Furthermore, the present invention does not cause the writing quality of the front part of the track of the optical disc to be poor, and the writing quality of the rear part of the track is better, that is to say, the use of the present invention can make the writing of the entire optical disc Quality remains above par.

In summary, although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any skilled person may make various modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the content defined by the scope of the patent application.

Claims (10)

1. A learning-type writing strategy adjustment device, which is used in an optical drive to burn a manufacturer-writable type of optical disc, including: A control chip, the control chip starts a write operation according to a write command from a host to receive a write data, and encodes the write data to form a modulation signal; a memory, at least one first writing strategy can be stored in the memory, and the first writing strategy can be applied to the writable type of the optical disc of the manufacturer; and An optical read-write head, which can receive a laser driving signal to record a plurality of bright and dark information on the optical disc; Wherein, when the control chip confirms that the manufacturer's writable type of the optical disc is loaded, the modulation signal and the first writing strategy are used to form the laser driving signal, and after the writing operation is completed, the control chip The chip can read a plurality of bright and dark information to generate a second writing strategy to be stored in the memory to replace the first writing strategy. 2. The learning-type write strategy adjustment device as claimed in claim 1, wherein the write operation can be one track at a time write operation, one sector at a time write operation, one disk at a time write operation Input action or write action of a packet write. 3. The learning write strategy adjustment device according to claim 1, wherein the difference between the first write strategy and the second write strategy is a pulse start time, a pulse end time, or a pulse width . 4. The learning write strategy adjusting device as claimed in claim 1, wherein the difference between the first write strategy and the second write strategy is a write power, an erase power, or a bias power. 5. The learning write strategy adjusting device as claimed in claim 1, wherein the memory is a non-volatile memory. 6. A learning-type writing strategy adjustment method, which is applied to an optical drive to burn a manufacturer-writable type of an optical disc, comprising the following steps: After the optical drive completes a writing operation using a first writing strategy stored in a memory, reading a writing data; judging whether the first write strategy needs to be adjusted according to a write quality of the read write data; When the first writing strategy needs to be adjusted, using the writing quality to generate a second writing strategy; and The second writing strategy is stored in the memory to replace the first writing strategy. 7. The learning-type write strategy adjustment method as claimed in claim 6, wherein the writing action can be a one-track writing action at a time, a sector-at-a-time writing action, and a disk writing action at a time Input action or write action of a packet write. 8. The learning-type write strategy adjustment method as claimed in claim 6, wherein the difference between the first write strategy and the second write strategy is a pulse start time, a pulse end time, or a pulse width . 9. The method for adjusting a learning write strategy according to claim 6, wherein the difference between the first write strategy and the second write strategy is a write power, an erase power, or a bias power. 10. The learning write strategy adjustment method as claimed in claim 6, wherein the memory is a non-volatile memory.

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