JPH0578107B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hard disk control system, and particularly to a hard disk control system in which a central processing unit controls a hard disk device via a hard disk controller.

[Conventional technology] Conventionally, in this type of hard disk control method,
Since the hard disk device is controlled using a hard disk controller, if the hard disk controller is changed due to a change in specifications, etc., the format of the hard disk device and the command format given to the hard disk controller must be changed to match the hard disk controller. There may be cases where this is necessary.

[Problem that the invention seeks to solve]

In the conventional hard disk control method described above,
Changing the hard disk controller may require changing the format of the hard disk device or the commands given to the hard disk controller. In such cases, it may be necessary to rewrite data or modify the program.
There was a problem that it became difficult to inherit software assets such as existing programs and data.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a hard disk control method that does not require changing the format or command format even when changing the hard disk controller.

[Means for solving problems]

The hard disk control method of the present invention includes a hard disk control method in which a central processing unit controls a hard disk device via a hard disk controller, in which a first hard disk drive including a bad sector flag and a sector number supplied from the central processing unit at the time of formatting the hard disk device is provided. While converting the format data into second format data including the cylinder number, head number, and sector number used in the hard disk controller, the bad sector flag of the first format data and the second format data are converted. a bad sector registration means for registering a bad sector by logically ORing it with the head number of the second format data as a new head number of the second format data;
A bad sector detection means is provided for detecting a bad sector by using the logical sum of a bad sector flag and a head number as a new head number when a write command is executed.

[Effect]

In the hard disk control method of the present invention, the logical sum of the bad sector flag of the first format data supplied from the central processing unit when formatting the hard disk device and the head number of the second format data used by the hard disk controller is calculated. A defective sector is registered by setting it as a new head number of format data No. 2, and a defective sector is detected by setting the logical sum of the defective sector flag and the head number as a new head number when executing a read/write command.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

A hard disk control method according to an embodiment of the present invention is a central processing unit (hereinafter abbreviated as CPU).
1, main memory 2, control unit 3, hard disk control mechanism (hereinafter abbreviated as HD control mechanism) 4, bad sector registration means 5, bad sector detection means 6, cache memory 7, hard disk A controller (hereinafter abbreviated as HD controller) 8 and a hard disk device (hereinafter referred to as HD controller)
It consists of 9 (abbreviated as HD device).

The CPU 1 and main memory 2 are located on the host side, and the control section 3, HD control mechanism 4, bad sector registration means 5, and bad sector detection means 6 are included in the disk cache system.

Referring to FIG. 2, the bad sector registration process during disk formatting in the hard disk control system of this embodiment includes a format data receiving step 21, an OR step 22, a format data generation step 23, and a format data generation step 23. It consists of a data sending step 24 and a final sector determination step 25.

Referring to FIG. 3, the defective sector detection process when executing a read/write command consists of a read/write command sending step 31 and a sector detection step.
32, a logical sum step 33, a read/write command retransmission step 34, a sector detection step 35,
Normal completion step 36 and bad sector notification step
37 and an error handling step 38.

Referring to FIG. 4, the 2-byte format data 41 sent from the CPU 1 consists of a bad sector flag BF and a sector number SN. The bad sector flag BF becomes 80H (H indicates a hexadecimal number. The same applies hereinafter) when the sector with the corresponding sector number SN is bad, and when it is normal.
This is a flag that becomes 00H.

On the other hand, the 4-byte format data 42 supplied to the HD controller 8 consists of a cylinder number (upper) CH, a cylinder number (lower) CL, a head number HN, and a sector number SN.

Referring to FIG. 5, a track in the HD device 9 is a series of sectors, and each sector has a cylinder number (upper) CH, a cylinder number (lower) CL, a head number HN, and a sector number SN at the beginning. It is formatted by writing a 4-byte identifier (ID).

Next, the operation of the hard disk control system of this embodiment configured as described above will be explained.

During disk formatting, a bad sector registration process shown in FIG. 2 is performed. First, the control section 3
receives the format data 41 from the CPU 1 in step 21. Next, in step 22, the logical sum of the bad sector flag BF and the head number HN is calculated.
Format data 4 sent from CPU1
The bad sector flag BF of 1 is 80H (H indicates a hexadecimal number; the same applies hereinafter) when the sector with the corresponding sector number SN is bad, and is 00H when it is normal. Therefore, the logical sum of this bad sector flag BF and the head number HN of the format data 42 supplied to the HD controller 8 is 82H in the case of a bad sector.
If it is a normal sector, it will be 02H.

Next, in step 23, format data 42 to be sent to the HD controller 8 is created. In this case, the cylinder number (upper) CH and cylinder number (lower) CL are 00H and 01H.
The head number HN is the logical sum of the above, and the sector number
SN is the sector number SN of format data 41
are stored, respectively, and format data 42 is created.

Next, in step 24, a format command is sent to the HD controller 8. Then, based on the format data 42, as shown in FIG. 5, the cylinder number (upper) CH, cylinder number (lower) CL, head number HN, and sector number are placed at the beginning of each sector as an identifier (ID). SN is written sequentially, and in the case of a bad sector, the head number HN becomes 82H, which is not possible in the first place, indicating that it is a bad sector, and in the case of a normal sector, the head number HN becomes 02H, indicating that it is a normal sector. represents something.

When a read/write command is executed, a defective sector detection process shown in FIG. 3 is performed. First, when a read/write command is sent to the HD controller 8 in step 31, it is detected in step 32 whether or not the corresponding sector has been found on the HD device 9. If the sector is found, it is notified in step 36 that the corresponding sector has been found, and the process ends normally. If not found, in step 33 the bad sector flag BF is logically ORed with the head number HN, and in step 34 the head number of this logical sum is calculated.
A read/write command is again sent to the HD controller 8 to read or write the sector having HN. Thereafter, in step 35, it is again detected whether a sector has been found, and if a sector has been found, a notification that the sector is a bad sector is notified in step 37, and the process is terminated. If the corresponding sector is not found, it is notified in step 38 that an error has occurred since no corresponding sector has been found, and the process is terminated.

〔Effect of the invention〕

As explained above, according to the present invention, even if an HD controller whose format data format is different from the previous one due to specification changes is used, the same read/write commands as when using the previous HD controller can be used to control the hard disk drive. Since reading and writing can be performed, it is possible to inherit software assets such as programs and data as they are without modifying programs or converting data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a hard disk control method according to an embodiment of the present invention, and FIG.
3 is a flowchart showing a bad sector registration process in the hard disk control method shown in FIG. 1; FIG. 3 is a flowchart showing a bad sector detection process in the hard disk control method shown in FIG.
FIG. 4 is a diagram showing a comparison of format data formats, and FIG. 5 is a diagram showing a track format. In the figure, 1...CPU, 2...Main memory, 3...Control unit, 4...HD control mechanism, 5...
Bad sector registration means, 6... bad sector detection means, 7... cache memory, 8... HD controller, 9... HD device.

Claims (1)

[Scope of Claims] 1. In a hard disk control method in which a central processing unit controls a hard disk device via a hard disk controller, a first controller including a bad sector flag and a sector number supplied from the central processing unit when formatting the hard disk device is provided. While converting the format data to second format data including the cylinder number, head number, and sector number used in the hard disk controller, the bad sector flag of the first format data and the second format data are a bad sector registration means for registering a bad sector by logically ORing the head number with the head number as a new head number of the second format data; A hard disk control method comprising: bad sector detection means for detecting a bad sector by setting a new head number.