JP2954833B2 - Diagnosis method of head seek operation in CD-ROM device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diagnostic method for testing a seek operation of a head of a CD-ROM device.
The present invention relates to a method for diagnosing a seek operation of a head in a CD-ROM device capable of performing diagnosis in a short time without using a dedicated medium for diagnosis.

[0002]

2. Description of the Related Art A CD-ROM can be accessed randomly, and data is spirally recorded on a medium. Conventionally, in order to diagnose the seek operation of the head that reads the recording medium, a dedicated medium in which a seek address is written in the data area of each block is used, and data is read in order from the head address of the medium and read data is read. Diagnosis is made based on whether or not the seek addresses match.

FIG. 6 shows a recording medium on which the above data is recorded in a spiral form.
As shown in FIG. 7, the synchronization signal SYC, the header information Haeder,
An area for recording data DATA and error detection / correction codes ECC and EDC is provided. Then, in the dedicated medium for seek operation diagnosis, the seek address of each block is written in the area for recording data DATA in FIG.

FIG. 8 is a flowchart showing the procedure of the above-described conventional seek operation diagnosis processing. The conventional diagnosis method will be described with reference to FIG. Although the blocks of the medium shown in FIG. 6 are numbered from 1 to X, normally, the seek address of a medium such as a CD-ROM is
0 minutes 2 seconds 0 to 0 minutes 2 seconds 74, 0 minutes 3 seconds 0 to 0 minutes 3 seconds 7
4,..., 60 minutes 18 seconds to 60 minutes 18 seconds 74, and the numbers 1 to X correspond to the seek addresses.

In order to diagnose the seek operation of the head, a dedicated medium for seek operation diagnosis in which a seek address is recorded in the above-mentioned data area is used. As shown in FIG. Reading is performed in order, and diagnosis is performed based on whether or not the read data matches the seek address. That is, first, in step S1, the read address is set to 0 minute 2 seconds 0 block. Next, in step S2, it is determined whether or not the read address is beyond the last block. If the read address exceeds the final address, the operation is stopped. If the read address does not exceed the last address, the process proceeds to step S3 to read one block.

At step S4, the read data is compared with the read address, and at step S5
, It is determined whether or not they match. If the read data and the read address match, the process goes to step S6, increments the read address by 1, returns to step S2, and repeats the above operation. If the read address does not match the read address, an error is output.

[0007]

As described above, the conventional diagnostic method requires a dedicated diagnostic medium in which a seek address is written in the data area of each block, and accesses all blocks of the medium. It took a very long time. The present invention has been made in order to solve the above-described problems of the related art,
It is an object of the present invention to provide a method of diagnosing a seek operation of a head in a CD-ROM device which can diagnose a seek operation of a head in a short time without using a dedicated medium for diagnosis.

[0008]

FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, reference numeral 1 denotes a medium such as a CD-ROM or the like on which data is recorded in a spiral manner and is randomly accessible, Y is a maximum address of the medium, Z is a minimum address, and X is an intermediate address calculated from the maximum address. is there.

Reference numeral 2 denotes a CD-ROM device for reading data recorded on a medium. Reference numeral 2a denotes a control unit. When a seek request is issued, the control unit 2a causes the head to seek to a requested address, and the seek operation fails. An error signal is output. According to a first aspect of the present invention, there is provided a method for diagnosing a seek operation on a medium 1 on which data is recorded in a spiral manner and which is randomly accessible, wherein a seek address is set to a maximum address in a radial direction of the medium. Y
And the minimum address Z are alternately changed one track at a time, and the seek operation is diagnosed by confirming that the seek operation at each seek address has been performed normally.

According to a second aspect of the present invention, there is provided a method for diagnosing a seek operation for a medium 1 on which data is recorded in a spiral manner and which is randomly accessible, wherein the seek operation of the medium is diagnosed by the following procedure. It is. (A) Find an intermediate address X between the maximum address Y and the minimum address Z of the medium 1. (b) Set the maximum address Y as the first seek address and the minimum address Z as the second seek address. The processes (i) to (v) are repeated until the first seek address exceeds the minimum address Z or until the second seek address exceeds the maximum address Y, and the seek operation at each seek is confirmed. (I) seek to a first seek address; (ii) seek to a second seek address; (iii) set a pass flag when the first or second seek address passes through the intermediate address X; (Iv) calculating a seek amount to be moved to an address position adjacent to the first seek address on a track adjacent to the first seek address position in the radial center direction of the medium; Subtracting the seek amount from the seek address, replacing the subtraction result with the first seek address,
(V) calculating a seek amount to be moved to an address position adjacent to the second seek address on a track adjacent to the second seek address position in the radial direction of the medium, and adding the seek amount to the second seek address; The seek amount is added and the result of the addition is replaced with a second seek address. (D) When the first seek address exceeds the minimum address Z or when the second seek address exceeds the maximum address Y By checking the passage flag, it is determined whether or not the diagnostic processing has been normally performed.

[0011]

In FIG. 1, the seek operation diagnosis processing means calculates an intermediate address X from the maximum address of the medium 1. Next, the seek amount is calculated, and as shown in FIG. 3, the seek request is sent to the CD-ROM device 2 while changing the seek address from the maximum address Y and the minimum address Z alternately by one track in the radial direction of the medium. Output to

When receiving a seek request, the control unit 2a of the CD-ROM device 2 seeks the head to the requested seek address. If the seek operation is not performed normally, an error signal is output. When the confirmation of the seek operation in the radial direction of the medium 1 is completed, the seek operation diagnosis processing means checks whether the seek address has passed the intermediate address X, and confirms that the diagnostic processing has been performed normally. .

According to the first aspect of the present invention, as described above, the seek address is alternately changed by one track from the maximum address Y and the minimum address Z in the radial direction of the medium, and the seek address at each seek address is changed. Since it is checked whether or not the operation is performed normally, the CD-ROM can be used in a short time without using a dedicated medium for diagnosis.
Diagnosis of the seek operation of the device can be performed.

In the invention of claim 2 of the present invention, the intermediate address X is obtained from the maximum address of the medium, and when the seek operation is diagnosed, it is determined whether or not the intermediate address has been passed. Can be confirmed whether or not was performed normally.

[0015]

FIG. 2 is a diagram showing the configuration of a system according to an embodiment of the present invention. In FIG. 2, reference numeral 11 denotes a host computer, and the host computer 11 has a SCSI (small computer s).
ystem interface) equipped with an adapter 11a, SC
Data is transmitted to and from the CD-ROM device 12 via the SI adapter 11a. The host computer 11 stores a seek operation diagnosis program 11b according to the present embodiment.

The CD-ROM device 12 comprises a control unit 12a and a deck unit 12b.
The OM 13 is set, and the control unit 12a sets the host computer 1
When a command or the like is received from the controller 1 to control a read operation of a CD-ROM in the deck unit 12b, such as a seek operation in the deck unit, the read data is transferred to the host computer, and a read error or the like occurs. To the host computer 11.

FIG. 3 is a diagram for explaining a diagnostic operation in the present embodiment. In the present embodiment, as shown in FIG.
The diagnostic program 11b tests the seek operation of the head by changing the seek address one track at a time in the radial direction of the medium. That is, the maximum address of the CD-ROM (FIG. 3)
Then, as shown in FIG. 3, the seek address is changed from the minimum address to the maximum address around the intermediate address (X in the figure) obtained by dividing Y) by half, and the seek address is changed from the maximum address to the next track of the minimum address. The seek address is changed to the seek address adjacent to the minimum address (minimum address + α), and the seek address is changed from the minimum address + α to the seek address adjacent to the track immediately before the maximum address (maximum address−β), Similarly, seek is performed while changing the seek address one track at a time, and the seek operation is confirmed.

FIGS. 4 and 5 are flowcharts showing the diagnostic processing by the above-described diagnostic program. The diagnostic processing of the present embodiment will be described in detail with reference to FIG. The diagnostic program 11b of the host computer 11 executes the processing in step S1 of FIG.
, The CD-RO through the SCSI adapter 11a
The final address of the CD-ROM medium set in the M device 12 (in this embodiment, the medium is not a dedicated medium for diagnosis but a normal medium) is obtained, and in step S2, the intermediate address of the medium is obtained from the final address. Ask for an address.

In step S3, seek address 1
Is set to 0 min 2 sec 0 block which is the minimum address, and in step S4, the seek address 2 is set to step S1
Set the last address obtained in. Next, in step S5, it is determined whether or not the seek address 1 is larger than the last address.
If it is larger, go to step S7. Next, in step S6, it is determined whether or not the seek address 2 is smaller than 0 minutes, 2 seconds, and 0 blocks.

Then, after step S7, as described later, it is determined whether or not an intermediate seek address has been passed, and whether or not the diagnostic processing has been normally performed is confirmed.
If it is determined in step S5 that the seek address 1 is not larger than the final address and that the seek address 2 is not smaller than 0 minute, 2 second and 0 block in step S6, the process goes to step S8 in FIG. Seek to address 1.

That is, the host computer 11 has a CD-RO
Issues a seek command to the M
Upon receiving the above command, the control unit 12a of the OM device 12 performs the following processing that is normally performed when reading a medium. The control unit 12a causes the head of the deck unit 12b to seek to the requested seek address, and reads the header information of the requested seek address of the medium.

As shown in FIG. 7, each block of the medium has a synchronization signal SYC, header information Haeder, and data DAT.
A, the error detection / correction codes ECC and EDC are recorded, and the control unit 12a reads the seek address in the header information and compares it with the above-mentioned requested seek address.
If the request address and the seek address in the header information do not match, an error signal is sent to the host computer 11.
Return to When an error signal is returned to the host computer,
The diagnostic program 11b of the host computer 11 determines that the seek operation has not been performed normally, interrupts the diagnostic processing, and displays an error. As a result, the operator knows that the seek operation was not performed normally, and stops the processing,
Alternatively, a re-execution instruction is issued.

When the request address matches the seek address in the header information and the seek to the seek address 1 is performed, the diagnostic program 11b of the host computer 11
Goes to step S9 and seeks to seek address 2. Then, as described above, if the seek is not performed normally and an error signal is returned to the host computer 11, the diagnostic processing is interrupted and an error display or the like is performed.

If the seek to the seek address 2 is normally performed, the process goes to step S10, where it is determined whether the seek address 1 or 2 has passed the intermediate address. If not, the process goes to step S12. If the vehicle has passed, the passage flag is turned on in step S11, and the process proceeds to step S12. In step S12, the seek amount to be moved to a position adjacent to the seek address 1 of the track next to the seek address 1 is calculated and added to the seek address 1. In step S13, the seek amount to be moved to a position adjacent to the seek address 2 of the track next to the seek address 2 is calculated, and is subtracted from the seek address 1.

Then, returning to step S5 in FIG. 4, as described above, in steps S5 and S6, whether seek address 1 is larger than the last address and whether seek address 2 is smaller than 0 minute, 2 seconds, 0 block. It is determined whether or not both are satisfied, and if both conditions are satisfied, the process goes to steps S8 and S9 again, and seeks to seek address 1 and seek address 2 calculated in steps S12 and S13 described above.

Hereinafter, steps S10 → S11 → S12 →
In S13 → S5 → S6, it is confirmed whether the seek operation is performed normally while changing the seek address,
If the seek address 1 is larger than the last address or the seek address 2 is smaller than 0 minute, 2 seconds, 0 block, the process goes to step S7 to determine on / off of the passage flag.

If the pass flag is on, the diagnosis process is normally performed and the process ends normally. If the intermediate flag is off, an error in the seek address calculation process occurs, and Abnormally ends because no diagnosis was made. As described above, in the present embodiment, each seek address is sought while the seek address is linearly changed one track at a time in the radial direction of the CD-ROM with the intermediate address as the center position, and the seek operation is confirmed. CD-ROMs in a short time without using a dedicated medium
A seek operation of a medium such as a ROM can be diagnosed.

In the above embodiment, an intermediate address between the maximum address and the minimum address is calculated, and whether or not the intermediate address has been passed is checked to determine whether or not the seek operation diagnosis processing has been normally performed. However, in the present invention, it is not always necessary to use the intermediate address, and the point is that any address that passes when the seek address is changed linearly in the radial direction of the CD-ROM may be selected.

In the present invention, the processing for determining whether or not the data has passed an intermediate address or the like is not essential.
This processing can be omitted if necessary. Also,
In the above embodiment, the diagnosis of the seek operation of the CD-ROM device has been described. However, the recording medium targeted by the present invention is not limited to the CD-ROM, and random access is possible. A medium on which data is recorded on a spiral, as shown in FIG.
If the medium has header information recorded in each block, C
In addition to the D-ROM, the present invention can be applied to any medium such as a magnetic optical disk.

[0030]

As described above, in the present invention, the seek operation at each seek address is normally performed by alternately changing the seek address from the maximum address and the minimum address by one track in the radial direction of the medium. Since it is checked whether or not the seek operation is performed, the seek operation of the CD-ROM device can be diagnosed in a short time without using a dedicated medium for diagnosis.

Further, when the intermediate address is obtained from the maximum address of the medium and the seek operation is diagnosed, it is determined whether or not the intermediate address has passed, so that it is easy to determine whether the diagnostic processing has been normally performed. Can be confirmed.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a diagram illustrating a system configuration according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a diagnosis operation in the present embodiment.

FIG. 4 is a flowchart illustrating a seek operation diagnosis processing procedure according to the embodiment;

FIG. 5 is a flowchart (continued) illustrating a seek operation diagnostic processing procedure according to the embodiment;

FIG. 6 is a diagram showing an arrangement of blocks of a recording medium recorded in a spiral shape.

7 is a diagram showing a data structure of each block of the recording medium shown in FIG.

FIG. 8 is a flowchart showing a conventional seek operation diagnosis processing procedure.

[Explanation of symbols]

 Reference Signs List 1 recording medium 2 CD-ROM device 2a control unit 11 host computer 11a SCSI adapter 12 CD-ROM device 11b diagnostic program 12a control unit 12b deck unit

Claims (2)

(57) [Claims] In a method for diagnosing a seek operation on a medium (1) on which data is recorded in a spiral manner and which is randomly accessible, a seek address is determined from a maximum address (Y) and a minimum address (Z) in the radial direction of the medium. A method of diagnosing a seek operation of a head in a CD-ROM device, wherein the seek operation is diagnosed by alternately changing one track at a time and confirming that the seek operation at each seek address has been normally performed. 2. A method of diagnosing a seek operation on a medium (1) on which data is recorded in a spiral manner and which is randomly accessible, comprising: (a) a maximum address (Y) and a minimum address (Z) of the medium (1);
(B) The maximum address (Y) is set to the first seek address and the minimum address (Z) is set to the second seek address. (C) The following (i) to (v) Until the first seek address exceeds the minimum address (Z), or
Is repeated until the seek address exceeds the maximum address (Y), and the seek operation at each seek is confirmed.
Seek to a first seek address; (ii) seek to a second seek address; (iii) set a pass flag when the first or second seek address passes through the intermediate address (X); iv) A seek amount to be moved to an address position adjacent to the first seek address on a track adjacent to the first seek address position in the radial center direction of the medium is calculated, and the seek is performed from the first seek address. (V) an address adjacent to the second seek address on a track radially adjacent to the medium with respect to the second seek address position; Calculate the seek amount to be moved to the position, add the seek amount to the second seek address,
The result of addition is replaced with the second seek address. (D) When the first seek address exceeds the minimum address (Z), or when the second seek address exceeds the maximum address (Y), the pass flag For determining whether or not the diagnostic processing has been performed normally
A method of diagnosing a seek operation of a head in a ROM device;