JPH0636474A - Disk device - Google Patents

Abstract

PURPOSE:To recognize the condition of a using medium and to evade the occurrence of a medium error due to an alternate processing by changing the number of retry at the time of recording and reproducing for the medium according to the number of errors at the time of test write. CONSTITUTION:After power on and medium insertion, test write processing being one of medium initialization processing is performed by an SCSI control part 4. The number of errors which occurs at the time of recording/verifying is recorded in a RAM 7 using optimum laser recording power by a test write processing means, and the device is constituted so that the retry counted at number at the time of recording and reproducing for respective media are changed by the number of errors. Thus, since the optimum number of retry at the time of recording and reproducing for the medium is decided, the probability of ocurrevce of the alternate processing is reduced, and the probability of occurrevce of the medium error is reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disc device, and more particularly to a disc recording / reproducing device for recording and reproducing information on a rewritable medium.

[0002]

2. Description of the Related Art Conventionally, as one of processings after power-on or insertion of a medium, trial writing is performed on the medium with various laser recording powers, and an optimum number for the medium is determined according to the number of errors generated by the laser recording powers. We are looking for a good laser recording power. In other words, the laser recording power with the smallest number of errors is
It is the optimum laser recording power, and the influence of the number of errors is not considered during trial writing. Further, the retry count during recording and reproduction is a fixed value in any situation.

When information is recorded on a medium by using an optimum laser recording power, information cannot be accurately recorded depending on the state of the medium (due to a certain error factor). In such a case, the disk device attempts a retry operation to record accurate information at the target sector address. If the information cannot be accurately recorded even after performing the retry process for the set retry count, the sector is regarded as a defective sector and the information is recorded in the alternate area (replacement process). However, depending on the state of the medium, accurate information can be recorded in the target sector address by increasing the number of retry counts to be set.

However, when a medium capable of recording accurate information in the target sector address by increasing the retry count is used, the replacement process is performed and the replacement sector is used as it is, and eventually the replacement sector is used. Causes a media error (medium error "alternative area is all used"), and information cannot be recorded or reproduced. In order to avoid such a situation, the disk device should grasp the state of the medium, set an optimum retry count for the medium, and prevent the replacement process from occurring as much as possible. Further, even if the retry count is changed and the information is recorded or reproduced on the medium in which the error is likely to occur, the alternation process is frequently generated to accelerate the speed at which the medium error occurs.

[0005]

[Purpose] The present invention has been made in view of the above circumstances, and before receiving an information recording command from a user,
The purpose of the present invention is to provide a disk device that grasps the state of the medium used and avoids the occurrence of a media error due to the replacement process.

[0006]

In order to achieve the above object, the present invention provides (1)
In a disk device that records and reproduces information on a rewritable medium in which tracks are formed in advance and a predetermined test writing area (calibration zone) is provided on the inner and outer circumferences, one of media initialization processing performed after power-on and insertion of the medium And a trial writing processing means, which is used for recording / recording using the optimum laser recording power.
The number of retries at the time of recording and reproducing for each medium is changed according to the number of errors generated at the time of verification, and further, (2) recording / verifying to the trial writing area on the inner circumference side by using the optimum laser recording power. If the number of errors (E1) that occurs when the recording is performed and the number of errors (E2) that occurs when the recording / verifying is performed on the trial writing area on the outer peripheral side are different, the radial position (R) of the medium To determine the retry count number during recording and playback from E1, E2, and R, and
(3) Characteristic of prohibiting recording and erasing of information on the medium when the number of errors generated when recording on the inner and outer test writing areas exceeds a predetermined number It is a thing. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining an embodiment of a disk device according to the present invention. Here, a magneto-optical disk device will be described. In the figure, 1 is a disk device, 2
Is a disk controller, 3 is a disk, 4 is a SCSI (Smal
l Computor System Interface) 5, CPU (Central Processing Unit), 6 ROM (Read Only Memory), 7 RA
M (Random Access Memory), 8 is buffer, 9 is SC
The SI controller, 10 is a SCSI bus, and 11 is a host computer.

The disk controller 2 is connected to the host computer 11 via the SCSI controller 4. A connection between the disk control unit 2 and the SCSI control unit 4 is called a drive interface, and a connection between the SCSI control unit 4 and the host computer 11 is called a host interface. SCSI is used as the host interface. SCSI is a small computer peripheral device interface. The features of SCSI are that the burden on the host bus can be reduced,
It is possible to connect a plurality of (up to eight) host computers and controllers on the bus, communication between controllers, and multitask processing.

FIG. 2 shows the media format (3.1.
1/2 inch magneto-optical disk ISO standard). The area marked with a cross is an area (calibration zone) in which trial writing is performed, and is used to determine the optimum laser recording power of the medium used. The area marked with a double circle is an area for recording the information actually transferred from the user. The disk device performs trial writing on a medium in the medium initialization process after power-on and after medium insertion. In this trial writing process, the disk device can know the state of the inserted medium from the number of errors that occurred during recording / verifying.

FIG. 3 is a diagram showing a flowchart of the trial writing process on the medium in the medium initializing process after the power is turned on and after the medium is inserted in the disk device according to the present invention. First, the optimum laser recording power is obtained by changing the laser recording power to the test writing area on the inner circumference side (a). When the number of errors generated when recording with the optimum laser power is larger than the write-inhibit value, the write-inhibit flag is set to ON (b), and the trial writing process ends. Normally, the write-protection flag is set to OFF. If the number of errors that occurred when recording with the optimum laser power is smaller than the write protect limit value, the number of errors (E1)
Is recorded in RAM.

Next, a trial writing process is performed on the trial writing area on the outer peripheral side (c), and the optimum laser recording power on the outer peripheral side is obtained (d). Similar to the write-protection flag setting process on the inner circumference side, if the number of errors generated when recording with the optimum laser recording power on the outer circumference side is larger than the write-protection value, the write-protection flag is set to ON (b ), And ends the trial writing process. If the number of errors generated when recording with the optimum laser power is smaller than the write inhibit value, the number of errors (E2) is recorded in the RAM. As described above, the first feature of the present invention is that if the number of errors that occur when trial writing is performed with the optimum laser recording power is larger than a predetermined value (write prohibition value), writing to the medium is prohibited, It is to make a disc (media) for playback (reading) only.

Further, in the disk device, optimum retry is performed at the innermost peripheral position (R1) and the outermost peripheral position (R2) of the information recording area (area where information is recorded from the user) depending on the number of errors E1 and E2 in the inner and outer peripheral portions. The numbers (X1, X2) are determined by a retry number determination map as shown in FIG. 4 (e). This retry number determination map is created by experimentally obtaining the optimal retry number based on the number of errors.

A second feature of the present invention is that the innermost position and outermost position of the information recording area (area for recording information from the user) are determined based on the number of errors in the inner and outer circumferences generated in the trial writing process on the medium. It is to determine the optimum number of retries at the position and change the number of retries depending on the radial position. As shown in FIG. 5, the relationship between the radial position (R) and the number of retries (X) is given by the following equation, assuming that it is a linear function. X = {(X2-X1) * R + X1 * R2-X2 * R1} / (R2-R1) R1: Information recording area innermost position R2: Information recording area outermost position X1: Number of retries at position R1 X2: Number of retries at position R2

FIG. 6 is a diagram showing a flow chart of processing at the time of recording information. When the information recording command is received from the host computer (f), the disk device analyzes the information recording command (g). Next, the write inhibit flag set in the trial write process is checked (h), and if the flag is ON, sense data, that is, an error code (write protect) is set (i), and the process for that instruction is performed. To end. Write protect flag is O
If it is FF, the retry count for the target address (address for recording information) is set by the formula given above (j), and information recording is performed.

[0015]

As is apparent from the above description, the present invention has the following effects. (1) Effect on claim 1: In the media initialization process, the optimum retry number at the time of recording / reproduction for the medium is determined according to the error state caused by the trial writing, so that the probability of the alternation process is reduced and
The probability that a media error will occur can be reduced. (2) Effect on claim 2: Since the optimum number of retries for the information recording / reproducing address on the medium can be determined, the probability of alternation processing is reduced and
Information can be accurately recorded and reproduced at that address. (3) Effect on claim 3: In the media initialization process, the information write is prohibited to the media depending on the error state caused by the trial writing, so that the occurrence of the media error can be avoided, and the read-only disc. As a (media), the life of a disc (media) can be extended.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a disk device according to the present invention.

FIG. 2 is a diagram showing a format of a medium according to the present invention.

FIG. 3 is a diagram showing a flowchart of a media trial writing process according to the present invention.

FIG. 4 is a diagram showing a retry number determination map of the present invention.

FIG. 5 is a diagram showing the relationship between the radial position and the number of retries according to the present invention.

FIG. 6 is a diagram showing a flowchart of processing at the time of recording information according to the present invention.

[Explanation of symbols]

1 ... Disk device, 2 ... Disk controller, 3 ... Disk, 4 ... SCSI (SmallComputor System Interfac)
e) 5 ... CPU (central processing unit), 6 ... ROM (Read
Only Memory), 7 ... RAM (Random Access Memor)
y), 8 ... buffer, 9 ... SCSI controller, 10
... SCSI bus, 11 ... host computer.

Claims (3)

[Claims] 1. A disk initializing process performed after power-on and insertion of a medium in a disk device for recording and reproducing information on a rewritable medium having tracks formed in advance and having predetermined test writing areas on the inner and outer circumferences. And a trial writing processing means, which is
A disk device characterized by changing the retry count number at the time of recording and reproducing for each medium according to the number of errors generated at the time of recording / verifying by using the optimum laser recording power. 2. The number of errors (E1) generated when recording / verifying the test writing area on the inner circumference side using the optimum laser recording power and recording / writing on the test writing area on the outer circumference side. When the number of errors (E2) generated at the time of verification is different, the number of retries during recording and reproduction is determined from E1, E2, and R according to the radial position (R) of the medium. The disk device according to claim 1. 3. The recording and erasing of information on the medium is prohibited when the number of errors generated when recording is performed on the inner and outer test writing areas exceeds a predetermined number. The disk device according to claim 1.