JP3410769B2 - Information recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording apparatus which uses an information recording medium such as a magneto-optical disk, an optical disk, a floppy disk, a hard disk, etc. The present invention relates to an information recording apparatus that facilitates a replacement process when a region is generated and information (data) cannot be recorded, and prevents a track deviation or the like from occurring to enable high-speed access.

[0002]

2. Description of the Related Art In an information recording medium such as a magneto-optical disc, an optical disc, a floppy disc, a hard disc, a defect is produced on the recording medium at the time of manufacture and subsequent use. In particular, in a magneto-optical disk or an optical disk, such defects are unavoidable under the present circumstances, so that all recording areas cannot be used for recording / reproducing information.

Therefore, conventionally, a normal sector is assigned to such a defective sector to perform recording / reproducing of information, that is, a so-called replacement process (for example, Japanese Patent Publication No. 4-8863). Gazette). That is, if the defect is a minor defect that normally occurs, it can be sufficiently dealt with by performing the conventional replacement process.

However, when the degree of defects increases,
Since an off-track or the like is generated, it is not possible to easily deal with it by the conventional countermeasure method. For example, if a defective sector exists on an information recording medium such as a magneto-optical disc or an optical disc, it is difficult to access a sector located behind the defective sector depending on the degree of the defect. .

[0005]

SUMMARY OF THE INVENTION The present invention solves such an inconvenience in the conventional replacement processing method, and a defect occurs not only in the position of the defective sector and the information of the replacement sector on which the replacement processing has been performed. By using a management table that stores information about the length in the radial direction and the degree of defect, it is possible to accurately grasp the state of the defect such as the information recording medium, and at the time of accessing the target sector,
It is an object of the present invention to provide an information recording apparatus which enables high speed and quick access without causing inconveniences such as track deviation.

[0006]

In order to achieve the above object, the invention according to claim 1 is a read / write control system and a motor for controlling the reproduction or recording operation of information on at least one information recording medium. the information recording apparatus having a mechanism control system for controlling the or head, the information recording medium
First registration means for registering information of the defective sector in the information recording medium, and information indicating whether or not the skip occurs when the head passes through the defective sector. Second registration means and the information recording medium
The length of the defective sector in the inner and outer circumferences of the body is recorded on the information recording medium.
And a third registration means for registering .

According to a second aspect of the invention, in the information recording apparatus according to the first aspect, the defect sector is present on the same track.
When accessing the target sector,
Detects tracks near and without defective sectors
And seek control means for seeking to the track
And the sector ID is checked to see if the defective sector has passed.
And seeks to the target sector after passing through the defective sector.
And a second seek control means for controlling .

The invention according to claim 3 is at least one sheet
Controls information reproduction or recording operation for information recording media
Read / write control system and control the motor and head
In an information recording device having a CPU for controlling a mechanism control system
The information of the defective sector of the information recording medium
The first registration means for registering on the recording medium and the head
Whether skipping occurs when passing through defective sectors
The second registration for registering information indicating whether or not to the information recording medium.
The recording means and the target cell existing on the same track as the defective sector.
Closest to the destination sector when accessing Kuta,
The track without defective sectors is detected and the
First seek control means for seeking to the
Check D to detect that the defective sector has passed,
Second seek to the target sector after passing through the defective sector
And seek control means . The invention according to claim 4, in the information recording apparatus according to claim 1, wherein the defect Se
It is provided with a first replacement processing means for carrying out replacement processing of the Kuta , and a second replacement processing means for carrying out replacement processing of a normal sector which is located near the defective sector and is inaccessible. According to a fifth aspect of the present invention, in an information recording apparatus having a read / write control system for controlling information reproducing or recording operation for at least one information recording medium and a mechanism control system for controlling a motor or a head, The information recording medium
The length of the defective sector in the inner / outer peripheral direction of the
Registration means for recording, means for checking whether or not there is a defective sector immediately before the target sector, and when the head passes the defective sector when there is a defective sector immediately before the target sector It is provided with means for checking whether skipping occurs and means for performing replacement processing for the target sector when skipping occurs.

[0009]

In the invention according to claim 1, the first registration means registers information of the defective sector of the information recording medium in the information recording medium, and the second registration means reads when the head passes through the defective sector. Information indicating whether or not skipping occurs is registered in the information recording medium. The third registration means is inside or outside the information recording medium.
Register the length of the defective sector in the circumferential direction on the information recording medium.
It

In the invention according to claim 2, the invention according to claim 1
In the information recording apparatus, the first seek control means has a defect
Access to the target sector existing on the same track as the sector
Of the defective sector that is closest to the target sector
Detects a nonexistent track and seeks to it
It The second seek control means checks the sector ID.
It is detected that the defective sector has passed, and the defective sector is notified.
After the error, seek to the target sector. In the invention according to claim 3, the first registration means stores information of a defective sector of the information recording medium.
Information is registered in the information recording medium, and the second registration means is the head.
A skip occurs when a document passes through a defective sector
Information indicating whether or not it is registered in the information recording medium. First sea
Control means is located on the same track as the defective sector.
Closest to the target sector,
At the same time, it detects a track with no defective sectors and
Seek to the rack. The second seek control means is
Check the data ID and detect that the defective sector has passed
Then, after passing through the defective sector, seek to the target sector is performed.
In the invention according to claim 4, the information recording apparatus according to claim 1
In the above, the first replacement processing means carries out replacement processing of the defective sector, and the second replacement processing means carries out replacement processing of the normal sector existing near the defective sector and inaccessible. In the invention according to claim 5, the information is recorded by the registration means.
The length of the defective sector in the inner and outer circumferences of the medium is the information recording medium.
Be registered with. Is checked whether the defective sector just before the target sector is present, checking whether the skip when the head passes through the defective sector when the defective sector is present immediately before the target sector is generated, When the skipped reading occurs, the replacement process is performed on the target sector.

[0011]

[Embodiment 1] Next, regarding the information recording apparatus of the present invention,
The embodiments will be described in detail with reference to the drawings. This embodiment corresponds to claim 1.

FIG. 1 is a functional block diagram showing an embodiment of the essential structure of the information recording apparatus of the present invention. In the figure, 1 is an information recording device, and 11 is its I /
An F controller, 12 is a CPU, 13 is a ROM, 14 is a RAM, 15 is a mechanism control system, 16 is a read / write control system, 17 is an information recording medium, and 2 is a host device.

The structure and operation of the information recording apparatus shown in FIG. 1 are basically the same as those of the conventional apparatus.
12 is controlled according to the flow of FIG. 3 described later. First, the configuration and operation common to the conventional one will be described.

[0014] host device 2 gives a command such as a read / write to the information recording apparatus 1, the information recording apparatus 1 executes an operation in accordance with the instruction. The I / F controller 11 of the information recording device 1 has a function of controlling an interface with the higher-level device 2. .

In this case, the CPU 12 controls the entire system of the information recording apparatus 1 according to the control software stored in the ROM 13 and operates each section.
The RAM 14 is a memory that temporarily stores information necessary for controlling the system, and stores information for managing defective sectors, that is, management information such as defective sector information in the replacement process.

The mechanism control system 15 has a function of controlling a mechanism portion of the information recording apparatus 1, such as a motor and a head. The read / write control system 16 controls a data read / write operation with respect to the information recording medium 17 such as a magneto-optical disk or an optical disk.

The above structure and operation are basically the same as those of the conventional device. In the information recording apparatus of the present invention, management information is registered by using a management table as shown in FIG. 2 below as information necessary for performing replacement processing, that is, management information for managing defective sectors. To do.

FIG. 2 is a diagram showing an example of a replacement management table used in the information recording apparatus of the present invention.

As shown in FIG. 2, in the management table, "defective track number" of a, "defective sector number" of b, "length of defect in inner circumferential direction" of c, and "outer circumferential direction" of d. Information of "defect length" and "defect degree" of e. First, the "defective track number" of a and b
The "defective sector number" of is the track number in which the defective sector exists and the defective sector number, respectively, and is the same information as the conventional one.

In the present invention, in addition to the information of a and b,
From the defective sector, the defect length (number of tracks) from the defective sector to the inner peripheral direction is defined as “the length of the defect in the inner peripheral direction” of c, and the “length of the defect in the outer peripheral direction” of d is The length of the defect in the outer peripheral direction (the number of tracks) is registered.
Further, as the “defect degree” of e, the defect degree of the defective sector, that is, the information indicating the area (skipping area) where a failure such as a track loss is likely to occur when the head passes through the defective sector is registered. .

When accessing the information recording medium for a data read / write operation or the like, a seek operation or the like is performed while referring to the information registered in this management table. Next, in the information recording apparatus of the present invention, the registration processing to the management table performed when a defective sector is found on the information recording medium during the read / write operation will be specifically described.

The track number to which the defective sector belongs,
The defective sector number is registered (a and b in FIG. 2). After that, it is checked whether or not the sectors having the same sector numbers in the adjacent tracks are registered as defective sectors. If not registered, the defect length in the inner peripheral direction and the defect length in the outer peripheral direction are respectively set to " 0 "(c and d in FIG. 2).

On the other hand, if the sectors having the same sector number in the adjacent tracks are already registered as defective sectors, the length of the defect in the inner peripheral direction and the length of the defect in the outer peripheral direction are calculated respectively. And set. Next, the length of the defect in the inner peripheral direction and the length of the defect in the outer peripheral direction of the already registered defective sector are respectively recalculated and set (c and d in FIG. 2).

Finally, from the above information, a range in which the track may be out of track when the head passes through the defective sector is obtained and registered as information on the degree of defect of the defective sector (e in FIG. 2). ). The table for defective sector management of such a format is set in a part of the non-data area on the information recording medium. However, when the table is set in the information recording apparatus of FIG.
It is loaded into the RAM 14.

Although FIG. 2 shows the case where there are N defective sectors, the maximum value that is likely to occur in the information recording medium is set. Next, the operation of the information recording apparatus of the present invention at the time of reading / writing data accompanied by the replacement process will be described with reference to a flowchart.

FIG. 3 is a flow chart showing the main processing flow at the time of reading / writing data accompanied by the replacement processing in the information recording apparatus of the present invention. In the figure,
# 1 to # 8 indicate steps.

At step # 1, a read / write operation is performed. In step # 2, check whether a defective sector is found. If no defective sector is found (when normal data read / write operation is performed), the flow of FIG. 3 is terminated.

On the other hand, when the defective sector is found as a result of checking in step # 2, the process proceeds to step # 3 to register the defective track number and the defective sector number.
In step # 4, it is checked whether the same sector number of the adjacent track has been registered as a defective sector.

If not registered as a defective sector, the process proceeds to step # 5 and the defect length in the inner circumferential direction (=
0) and information on the length of the defect in the outer peripheral direction (= 0) are respectively registered, and the process proceeds to step # 8. If the same sector number of the adjacent track has already been registered as a defective sector as a result of the determination in the previous step # 4, the process proceeds to step # 6 and the length of the defect in the inner circumferential direction and the defect in the outer circumferential direction are detected. Register length and length, respectively.

In the next step # 7, with respect to the registered defective sector, the lengths of the respective defects in the inner peripheral direction and the outer peripheral direction are calculated and registered, and the process proceeds to step # 8. In step # 8, the degree of the defect is obtained and registered from the length of the defect in the inner peripheral direction and the length of the defect in the outer peripheral direction.

By the processing of the above steps # 1 to # 8, the operation at the time of the replacement processing by the information recording apparatus of the present invention,
That is, along with the registration of the defective sector information similar to the conventional one, the information on the defective sector area and the information on the degree of defect of the defective sector are registered in the management table as shown in FIG. At the time of subsequent access, the seek operation is performed by the information registered in this management table, and the control in that case is basically the same as the conventional one.

[0032]

Second Embodiment Next, a second embodiment will be described. This embodiment mainly corresponds to claims 2 and 3 , but is also related to the invention of claim 1. In the above embodiment, the replacement process when a defective sector exists on the information recording medium and the management table used in that case have been described.

The second embodiment is characterized in that the seek operation is performed so that the target sector can be surely and quickly accessed by the information registered in the management table. Here, an example of an information recording medium having a defective sector will be shown.

FIG. 4 is an enlarged view of a part of an information recording medium having a defective sector. In the figure, the vertical direction indicates tracks, and the horizontal direction indicates sectors. The X mark is a defective sector, the O mark is the target sector, and the Δ1 and Δ2 marks are temporary targets for seek operation when the degree of defect is large. Indicates a sector.

In FIG. 4, it is assumed that there are defective sectors marked with X in track numbers 1 to 3 on the information recording medium. The rotation direction is the direction of the lower arrow. Then, in the case of accessing the track in which the defective sector exists, the sector marked with a circle on the track number 2 is set as the target sector.

As described above, when the target sector existing on the same track as the defective sector is accessed, as shown in FIG.
The degree of defects is checked by the management table of. If the degree of defect is large, the target sector (○
The track (track number 4) that is closest to the mark () and has no defective sector is searched for, and seek is performed.

Then, while checking the sector ID (sector number), it waits for the sector marked with Δ1 and the next sector to pass, and after detecting the sector marked with Δ2, the track where the target sector exists ( Seek to track number 2).
By thus seeking on the track having no defective sector, it is possible to access without causing a track deviation, etc., and the target sector (marked with a circle) can be accessed quickly and accurately.

FIG. 5 is a flow chart showing the main processing flow when the target sector is accessed according to the second embodiment in the information recording apparatus of the present invention. In the figure, # 11 to # 15 indicate steps.

In step # 11, it is checked with reference to the management table shown in FIG. 2 whether a defective sector exists on the same track as the target sector. If there is a defective sector, it is checked in the next step # 12 whether the degree of defect of the defective sector is large.

If the degree of defect is large, step # 1
Proceed to step 3 to find the closest track having no defective sector from the target sector, and seek to that track. In step # 14, while checking the sector ID, wait until the defective sector passes, and proceed to step # 15.

When it is detected in the previous step # 11 that no defective sector exists on the same track as the target sector, and when the degree of the defective sector is not large in step # 12, Go to # 15. In step # 15, a seek is made to the track where the target sector exists.

By the processes of steps # 11 to # 15 described above, even if a defective sector exists on the same track as the target sector and the degree of the defect of the defective sector is large, a fault such as a track deviation occurs. Without doing so, it becomes possible to access the target sector quickly and reliably.

[0043]

Third Embodiment Next, a third embodiment will be described. This embodiment mainly corresponds to claims 4 and 5 , but is also related to the invention of claim 1. In the third embodiment as well, the management table described in the first embodiment is used, but when a defective sector exists on the information recording medium, the normal sector existing near the defective sector is The feature is that replacement processing is performed when access is not possible.

For example, when a defective sector exists immediately before the target sector, the degree of defect is checked by the management table shown in FIG. If the degree of the defect is large, the replacement destination of the sector (normal target sector) is searched for, and the write processing is performed by the normal replacement processing.

After write processing, verify processing is performed,
When an error occurs, look for another replacement,
Perform replacement processing. The above operation is shown by a flow.

FIG. 6 is a flow chart showing the main processing flow in the replacement processing in the third embodiment of the information recording apparatus of the present invention. In the figure, # 21- #
25 shows a step.

In step # 21, it is checked with reference to the management table shown in FIG. 2 whether a defective sector exists immediately before the target sector. If there is a defective sector, it is checked in the next step # 22 whether the degree of defect of the defective sector is large.

If the degree of defect is large, step # 2
In step 3, in order to perform the replacement process for the target sector, the replacement destination sector is searched for, and the process proceeds to step # 24. When there is no defective sector immediately before the target sector (step # 21) or when the degree of defect in the defective sector is not large (step # 22), the process proceeds to step # 24.

In step # 24, the write operation is performed, and in the next step # 25, it is checked whether an error has occurred. If an error occurs, the process returns to the previous step # 23 and the replacement process is performed.

When it is detected in step # 25 that no error has occurred (normal write operation has been performed), the flow of FIG. 6 is terminated. By the processing of steps # 21 to # 25, even if an originally normal sector has a defective sector with a high degree of defect immediately before that, replacement processing is executed, so during playback, access due to a track off or the like occurs. The inconvenience of becoming impossible is avoided in advance.

[0051]

According to the first to fourth aspects of the invention, there is provided the second registration means for registering the information indicating whether or not the read skip occurs when the head passes through the defective sector in the information recording medium. Therefore, it is also possible to register the degree of defect of a sector in which a defect actually occurs (whether or not the read skip occurs due to a fault such as a track loss) in the information recording medium,
As a result, the defect information can be registered in the information recording medium in more detail than in the normal replacement process. That is, it becomes possible to register an area where skipped reading can be registered in the information recording medium and to understand that the area cannot be accessed. Also,
It can make various alternate processing as in the invention according to claim 3 or 4 for the defect information rely.

In the inventions according to claims 2 and 3, when the target sector is accessed, if there is a defective sector on the same track as the target sector, the defect sector is first closest to the target sector and no defective sector exists. It is possible to seek to a track, check the sector ID (number), wait until the defective sector passes, and then seek to the target sector after the defective sector passes. Therefore, reliable and high speed access to the target sector becomes possible.

According to the fourth aspect of the invention, the defective sector on the information recording medium and the sector which cannot be accessed due to the defect (normal sector without defect) are also replaced so that the defective sector exists. You can prevent access to nearby areas. Therefore, obstacles such as a track off occurring at the time of access are prevented in advance, and high-speed access and improvement of data reliability are achieved. In the invention according to claim 5, when the defective sector exists immediately before the target sector, it is checked whether or not the read skip occurs when the head passes through the defective sector. Since the replacement process is performed for the sector, it is possible to avoid the inconvenience of being inaccessible due to a track off or the like.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a main part configuration of an information recording apparatus of the present invention.

FIG. 2 is a diagram showing an example of a management table for replacement processing used in the information recording apparatus of the present invention.

FIG. 3 is a flowchart showing a main processing flow at the time of reading / writing data accompanied by a replacement process in the information recording apparatus of the present invention.

FIG. 4 is an information recording medium having a defective sector,
It is the figure which expanded and showed a part of it.

FIG. 5 is a flow chart showing a main processing flow when the target sector is accessed according to the second embodiment in the information recording apparatus of the present invention.

FIG. 6 is a flowchart showing a main processing flow at the time of replacement processing in the third embodiment of the information recording apparatus of the present invention.

[Explanation of symbols]

1 Information recording device 11 I / F controller 12 CPU 13 ROM 14 RAM 15 Mechanism control system 16 read / write control system 17 Information recording medium 2 Upper device

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 20/10

Claims (5)

(57) [Claims] 1. An information recording apparatus having a read / write control system for controlling an information reproducing or recording operation for at least one information recording medium and a mechanism control system for controlling a motor and a head. In the first recording means, first registration means for registering information on a defective sector of the information recording medium on the information recording medium, and information indicating whether or not skipping occurs when the head passes through the defective sector, and second registration means for registering the information recording medium, the length of the inner and outer peripheral direction of the defective sectors of the information recording medium wherein
An information recording apparatus, comprising: a third registration means for registering in an information recording medium . 2. The information recording apparatus according to claim 1 , wherein the target sector existing on the same track as the defective sector is accessed.
The closest to the target sector and the defective sector
Track that does not exist and seeks to that track
And a first seek control means for checking the sector ID to check that the defective sector has passed.
After detecting and passing through the defective sector, seek to the target sector
Second seek control means for controlling the information recording apparatus. 3. Information is recorded on at least one information recording medium.
Read / write control to control information playback or recording operation
Controls the system and the mechanism control system that controls the motor and head
In an information recording device having a CPU, information on a defective sector of the information recording medium is recorded on the information recording medium.
And a first registration means for registering with the head and skipping when the head passes through the defective sector.
Information indicating whether or not the
The second registration means for recording and the access to the target sector existing on the same track as the defective sector.
When Seth, closest to object sector, and a defect section
Track that does not exist and seeks to that track
And a first seek control means for checking the sector ID to check that the defective sector has passed.
After detecting and passing through the defective sector, seek to the target sector
Second seek control means for controlling the information recording apparatus. 4. The information recording apparatus according to claim 1, wherein the first replacement processing means performs replacement processing of a defective sector , and replacement processing of a normal sector existing near the defective sector and inaccessible. An information recording apparatus comprising a second replacement processing means. 5. An information recording apparatus having a read / write control system for controlling information reproducing or recording operation for at least one information recording medium and a mechanism control system for controlling a motor and a head. In the above, the length of the defective sector in the inner and outer peripheral directions of the information recording medium is
Registration means for registering on the information recording medium, means for checking whether or not a defective sector exists immediately before the target sector, and when the defective sector exists immediately before the target sector, the head detects the defective sector. An information recording apparatus comprising: means for checking whether or not skipping occurs when passing; and means for performing replacement processing for the target sector when skipping occurs.