JPS62277678A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To decrease the burst errors by storing the information read out of an ID area where the address information on plural sectors having the prescribed relative positional relations with divided sectors into a prescribed place and then referring to said stored address information as necessary. CONSTITUTION:The address information on sectors include the track numbers and sector numbers and these logic tracks are concentric with each other. Thus a recording/reproducing head 6 scans repetitively the same logic track. Therefore the next sector address can be fixed from the track number included in the ID information and the next sector number as long as said ID information is read at a certain sector owing to a fact that the track number of the next sector is equal to that of the present sector. Then a recording/reproducing control means 3 sends the fixed next sector address to an ID memory means 10. Thus the sector addresses can be recognized just by reading the useful information in one of plural ID areas where the sector address information are recorded. As a result, the high reliability is secured for the recognition of addresses as well as burst errors.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a recording/reproducing device for recording information on or reproducing information from a recording medium that records information by dividing it into a plurality of sectors. This is particularly effective for optical recording and reproducing devices that perform high-density recording and reproducing.

BACKGROUND OF THE INVENTION In recent years, there has been a trend toward higher density recording and reproducing devices used as external storage devices T for electronic computers, and as a result, errors in reproduced information due to defects in recording media tend to increase. The information to be recorded is an error correction code (hereinafter referred to as EC).
C) is often added for recording. However, since it takes a certain amount of time to decode a code word with this ECC added, ECC with such strong correction ability is not added to the so-called ID area that records ID information such as address information. No, so-called C
It is common to add only an error detection code such as an RC code. This is because there is not enough time between reading the information in the IDjJf area and reaching the data area immediately after it.

Therefore, CRC is used for ID information of each sector such as address information.
When recording or reproducing information using a recording medium in which a coded ID block is written multiple times in the ID area, an address can be recognized from any ID block in the ID area. A recording/playback device with improved reliability! : 1g.

Hereinafter, a recording method of the above-mentioned conventional recording/reproducing apparatus will be explained with reference to the drawings.

FIG. 4 is a block diagram of a conventional recording/reproducing apparatus, and FIG. 5 is a conceptual diagram of the format of a recording medium used in the above-mentioned conventional example. In FIG. 4, reference numeral 1 denotes a recording medium, which is divided into a plurality of sectors (1) 1 and records information thereon.

Reference numeral 2 denotes an external device that instructs the recording medium 1 to record predetermined information in a sector at a predetermined address, or instructs to read information from a sector at a predetermined address. 4
is a modulation means that converts the information to be recorded into a code and outputs a channel code that enables improved recording density and sector chronoking, which extracts a read clock from a reproduced signal. 5 is a driving means, and 6 is a recording/reproducing head. The driving means 5 drives the recording/reproducing head 6 so as to change the recording medium 1 according to the channel code.

A waveform shaping means 7 shapes the waveform of the signal read from the recording medium 1 by the recording/reproducing head 6 to reproduce a channel code. Reference numeral A denotes demodulation means, which inversely converts the channel code reproduced by the waveform shaping means 7 to reproduce the original information.

Reference numeral 55 denotes a control means which recognizes the address from the information reproduced by the demodulation means 8 and controls each block so that the information is recorded and reproduced in a predetermined sector. FIG. 5 shows the formant within one sector. In the figure, 60 is an ID area in which ID information such as sector address information is recorded. 38 is the same! ! This is the part that pulls in the PLL for extracting a clock from the reproduced signal in the Jl area. 62 to 65 are ID blocks, each with the same ID
Contains information.

Reference numeral 21 denotes a data area where information to be recorded is recorded, and redundant codes for error detection, error correction, etc. are added as necessary. 39 is a gap for absorbing a timing shift when recording information in the data area 21 after the ID area 60.

The operation of the recording/reproducing apparatus using the recording medium of the above format will be described below.

First, when recording data in a predetermined sector, external device 2. sends the address of a predetermined sector to the control means 55, and the control means 55 stores this address information. The recording/reproducing head 6 scans the recording medium 1 to read the signal, and the demodulating means 8 outputs the reproduced information. From this reproduced information, the control means 55 determines the I in the ID area 60.
The information of the D block 62 is extracted and the address is recognized. If the correct information cannot be read from the ID block 62, 10 blocks 63. Information is sequentially read from the ID blocks 64, and if information can be read from any ID block, the address of that sector can be recognized. When the control means 55 reads the address information in this way, it compares the address of the sector with the address information sent from the external device 2 and stored internally. The information to be recorded is transferred to the modulation means 4. The modulating means 4 converts the input information into a channel code and outputs it, and the driving means 5 drives the recording/reproducing head 6 in accordance with this channel code. In this way, the data area 21 of a predetermined sector of the recording medium 1 is
The channel code is recorded. When reproducing information from a predetermined sector, the process is the same as for recording until the address of the desired sector is found, and once the address of the desired sector is found, the information is recorded in the data area 21 of that sector. The control means 55 reproduces the information stored in the external device 2 and transfers the information to the external device 2. In this manner, in this conventional recording/reproducing device, ID blocks are multiplexed in the IDmI area, so it is possible to improve the reliability of reading address information. (For example, JP-A-60
-106073).

Problems to be Solved by the Invention However, in the above configuration, multiple ID
Errors in reading long consecutive pieces of information (hereinafter referred to as burst errors) because blocks are recorded in succession
By ID? There is a possibility that all ID blocks within the +1 area will become unreadable, and in order to obtain sufficient reliability even against long burst errors, it is necessary to increase the number of multiple writes, resulting in a large degree of redundancy. It had the problem of becoming.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a recording and reproducing apparatus that can reduce redundancy due to multiple writing and can recognize addresses with sufficient reliability even in the case of long burst errors.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention includes:
At least one read from the ID5U area of a recording medium that is divided into a plurality of sectors, each sector having an ID area in which address information of a plurality of sectors in a predetermined relative positional relationship with respect to the sector is recorded. Information related to sector ID information is stored in a predetermined location, and when recognizing the address of a sector in a predetermined positional relationship with this sector, the address information stored in the predetermined location is referred to. It is intended to do so.

Effects of the present invention With the above-described configuration, the ID information corresponding to each sector is recorded multiple times in a plurality of IDfiJ areas, so that the ID information of a predetermined sector is recognized at least once in these IDgll areas. Moreover, since these ID areas are separated from each other by the data area, the probability that all of the above ID information becomes unreadable due to a burst error is low. Therefore, I in the ID area
The reliability of confirmation of D information can be made extremely high.

Embodiment Hereinafter, a recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a recording and reproducing apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are conceptual diagrams of the format of a recording medium used in this recording and reproducing apparatus. In Figure 1,
2 is a recording medium, 2 is an external device, 4 is a modulation means, 5 is a drive means, 6 is a recording/reproducing head, 7 is a waveform shaping means, and 8 is a demodulation means, which are the same as the conventional example shown in FIG. . What is different from the conventional example is the control means 3 and the ID storage means IO, and the control means 3 stores the ID from the information output from the demodulation means 8.
While extracting information, the address of the current sector is recognized, and the ID information of other sectors is left as is or the result of comparison with the target address of a predetermined sector is transferred to the ID storage means 10. The ID storage means 10 stores this information sent from the control means 3. FIG. 2 shows the sector format of the recording medium used in the recording and reproducing apparatus of this embodiment, where 21 is a data area, 38
The synchronization areas 38 and 39 are gaps, which are the same as in the conventional example. What is different from the conventional example is the configuration of ID blocks 22 and 23 included in the ID9i area 20, where 24 is an address mark for byte synchronization, 25 is the track number of the logical track to which this sector belongs, and 26 is the sector of this sector. Number, 27 is the attribute of this sector, 2
8 is the sector number of the next sector, 29 is the attribute of the next sector, and 30 is the CR which is a redundancy code for error detection.
It is a C code. FIG. 3 shows the information track of the recording medium used by the recording and reproducing apparatus of this embodiment. The information track is divided into a plurality of logical tracks, 50 is the nth logical track, 51 is the fi+1th logical track, and the information track is divided into a plurality of logical tracks. The logical track 52 is the n-1th logical track.

The operation of the recording/reproducing apparatus of this embodiment using a recording medium having the above format will be described below.

First, when reading data in a sector at a predetermined address, the predetermined address is designated by the external device 2, and the control means 3 stores this. The recording/reproducing head 6 scans the recording medium 1, and the output thereof is waveform-shaped by the waveform shaping means 7 to output a channel code obtained. The demodulating means 8 inversely converts this channel code to reproduce and output the original information. The above operation is the same as that of a conventional recording/reproducing device. Furthermore, the control means 3 selects ■+gI! from the above-mentioned reproduced information! The information of the ID block 22 included in the area 20 is extracted and read. To extract information from the ID block 22, the demodulation means 8 finds the address mark 24, which is made up of a unique code that does not exist in normal information, and then transfers a predetermined number of bytes of information to the control means 3 and reads it. It is done by In this ID block 22, a CRC code 30 is recorded together with ID information such as address information. When the CRC check is performed and the information is found to be correct, the control means 3 stores this information in the ID storage means 1.
0 and stored in a predetermined location, and if it is incorrect, predetermined information that does not actually exist is stored in the predetermined location. In the next ID block 23, information is similarly read and similar processing is performed. The control means 3 refers to the information of the location where the ID information of the current sector is to be stored among the ID information stored in the ID storage means 10, and stores the ID information read in at least two ID blocks. Only when the address information of the current sector is recognized and both fail, it is assumed that the address of this sector has been correctly recognized. As described above, the control means 3 reads the addresses of a predetermined sector in at least two ID blocks included in the ID5J area of the predetermined sector and the 1DjJf area of the previous sector without detecting an error, and reads them. If they match, it becomes possible to recognize the address of a predetermined sector. Thereafter, the operation of reproducing information in a predetermined sector is the same as in the conventional recording/reproducing apparatus.

On the other hand, when rewriting the information of a predetermined sector, the control means 3 rewrites the IDjl! of the current sector from at least one ID block from the IDFII area of the current sector and from at least two ID blocks from the entire ID block. The address of this sector is considered to be recognized only when the first information is read and they match. Thereafter, the operation when finding the address of a predetermined sector and rewriting the information in that sector is the same as in the conventional example.

As explained above, according to the present invention, the address information of each sector is multiplexed in the IDjJI area of that sector and the ID area of the previous sector, so the reliability of recognizing the address of each sector is improved. Furthermore, since the ID areas are separated from each other by the data area, sufficient reliability can be obtained with relatively little redundancy even against long burst errors.

Next, the operation when the control means 3 transfers the ID information of the next sector to the ID storage means 10 will be explained. In conventional magnetic disks, information tracks are formed in concentric circles, and each of the annular information tracks is treated as one logical track, and serial numbers are sequentially assigned to each of the annular information tracks.

This is called a track number, and each logical track consists of a plurality of sectors, which are also given serial numbers.

This is called the sector number. However, sector numbers are not necessarily assigned sequentially, but may be assigned at intervals (this is usually called sector interleaving). Sector address information consists of this track number and sector number. Since these logical tracks are concentric, the recording/reproducing head 6 repeatedly scans the same logical track. Therefore, if ID information can be read in a certain sector, the track number of the next sector is the same as the current sector, so the address of the next sector is determined by the track number included in this ID information and the sector number of the next sector. can be determined. Therefore, the control means 3 transfers this to the ID storage means 10.

On the other hand, in optical discs, tracks are often formed in a spiral shape, and in this case there is only one information track, but each track is divided into sections and each track is defined as a logical track.
Conventionally, it has been common to assign track numbers sequentially.

On the other hand, in this embodiment, as shown in FIG. 3, the information track is placed every half a minute and track numbers are sequentially assigned to the information track. Then, the next 51 becomes the (n+1)th logical track. When the recording/reproducing RAD 6 scans this n-th logical track 50 and continues scanning, the logical tracks to be scanned shift sequentially to the (n+1)-th logical track, the (n+2)-th logical track, and so on. Therefore, for example, if you want to repeatedly scan the n-th logical track 5o,
While scanning the +1st logical track 51, the information track is skipped in the direction of returning one track (hereinafter, this is referred to as a track jump). However, since the address information of the first sector of the nth logical track 50 is recorded in the ID area of that sector and the IDfiI area of the last sector of the n-1th logical track 52 before it, When scanning the logical track 50, the scanning is repeated including the sector immediately before the logical track 50.

Therefore, the track jump is completed before reaching the last sector of the n-1th logical track 52. In this way, the n-th logical track 50 can be repeatedly scanned every rotation, and the addresses of all sectors belonging to the n-th logical track 50 can be scanned in the ID area of that sector and the previous sector. It becomes possible to read from the ID area. However, although the sector number of the first sector of the n-th logical track 50 is recorded in the IDfII area of the last sector of the n-1-th logical track 52, the track numbers are different. Therefore, information indicating that the last sector of each logical track is the last sector is recorded in the portion where the attributes of the last sector of each logical track are recorded. If you do this, the ID of the last sector of the logical track
Since it can be seen from the area that that sector is the last sector of the logical track, the track number of the logical track to which the next sector belongs will be the track number recorded in the ID area plus 1. The address information of the next sector can be completely recognized.

By doing the above, the track number of the sector following each sector can be estimated from the track number of that sector, so the track number recorded in the IDwi area is
Only the track number of the sector to which the D area belongs is required, and therefore the amount of information to be recorded in the ID area can be reduced.

In the above embodiment, in the ID1JT area of each sector,
Although the address information of that sector and the address information of the next sector are recorded, the address information is not necessarily limited to that, and the address information of a sector that is later than the next sector or the address information of more sectors is recorded. record and
The ID storage means 10 may be able to store more information.

Furthermore, in this embodiment, address information can be read in multiple ID blocks, and the address is recognized as correct only when the ID blocks fail, but this is not detected by the commonly used 2-byte CRC code. This is because the probability of Error cannot be ignored, and there is a possibility that even though an address is read by mistake, it may be mistaken as a correct address. then at least one ID
If address information can be read in a block, there is no problem in recognizing this as correct address information. In addition, in that case, the ■D storage means 10 does not need to store all the address information read from the ID area (the IDjl
It is sufficient to store only the address information of sectors other than the sector to which the area belongs until the ID information of the subsequent sector is read.

Furthermore, in this embodiment, when recording or rewriting information in a predetermined sector, the ID5 of that sector is
It was assumed that the address was recognized only when address information could be read from at least one ID block included in the Jt area, but this is because the ID of the sector before the specified sector
If the tracking control is lost and the track jumps to another track after recognizing the address of a predetermined sector in the area, and the information in the next ID area cannot be read, there is a risk of destroying the information in other logical tracks. This is because it becomes expensive.

Therefore, if the countermeasures against trunking failure are perfect, even if the address of a given sector can only be read in the sector before the given sector, information can be recorded or rewritten in the given sector. You may also do so.

Furthermore, in this embodiment, ID blocks having address information of a plurality of sectors are multiple-written in each ID area, but it is not necessarily necessary to perform multiple writing within each ID area; Only ID information may be recorded, ID blocks of a plurality of mutually different sectors may be recorded in one ID area, and the control means 3 may always read all ID blocks.

Effects of the Invention As described above, the present invention provides information on I/O such as address information of each sector.
Predetermined information related to ID information of at least one sector read from an ID area of a recording medium in which address information of a plurality of sectors having a predetermined relative positional relationship with respect to the sector is recorded in an ID area in which D information is recorded. , and when recognizing the address of a sector in a predetermined positional relationship with this sector, the information stored in the predetermined location is referred to.
In order to recognize the address of a sector, it is sufficient to read significant information in any one of a plurality of ID areas in which address information of the sector is recorded, and the effect of increasing the reliability of address recognition can be obtained. Furthermore, since the plurality of ID areas are separated from each other by the data area, sufficient reliability can be obtained even against long burst errors.

Furthermore, when recording information in a predetermined sector, it is recorded only when the address of that sector can be recognized in the ID area of the predetermined sector, and when reproducing information from a predetermined sector, the address information of that sector is By making it possible to read only the ID area, it is possible to access a given sector with extremely high reliability during playback, and at the same time, there is no risk of accidentally destroying information on other logical tracks during recording. It is possible to achieve the effect of being able to reduce the amount of damage.

Furthermore, the correct address is determined only when the information is read without error detection in at least two ID blocks of the plurality of [D blocks in which address information of a predetermined sector is recorded, and these address information match]. By recognizing the address as , the probability of misidentification of an address due to failure to detect an error can be extremely reduced.

Furthermore, the control means reads the track number of that sector, the sector number of that sector, and the sector number of the next sector from inside the ID area, and estimates the track number of the next sector from the track number of this sector. The effect is that the number of bytes of ID information recorded in the 1DjJT area can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a recording and reproducing apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are conceptual diagrams of the format of a recording medium used in the above embodiment, and FIG. 4 is a block diagram of a conventional recording and reproducing apparatus. FIG. 5 is a conceptual diagram of the formant of a recording medium used in a conventional recording/reproducing apparatus. 3... Control means, 10... Address storage means, 20... ID area, 21... Data ILT area, 22.23...・ID block, 2
8...Sector number of the next sector, 29...
...Attributes of the next sector. Name of agent: Patent attorney Toshio Nakao, 1 person, 24, 3F
-m-Address mark, 32-) Rack number zg, 33-Sector number 27.34-(Sector) A address 28, 35-(Next sector) Sector number 2'7.36
- (next sector) 1 stroke 30, . 37-c, Rc code 3B-@Jishangcheng 39- Gimap 2nd Figure-1-Record 8 50-(71, for each stroke) Logical track 57--(n+1 Katsuki's) Distance track 52-(72 −
100) Logical track, etc. 3 diagrams

Claims (6)

[Claims] (1) Read from the ID area of a recording medium that is divided into multiple sectors, each sector having an ID area in which address information of multiple sectors in a predetermined relative positional relationship with respect to the sector is recorded. ID storage means for storing information related to at least part of the ID information of a plurality of sectors in a predetermined location; 1. A recording and reproducing apparatus comprising: control means for controlling recording or reproducing of information with respect to the sector. (2) A patent characterized in that the ID storage means stores information that does not exist as ID information in the predetermined location if the ID information to be stored in the predetermined location cannot be read correctly from the ID area. A recording/reproducing device according to claim (1). (3) When recording information in a predetermined sector, the control means determines the ID information from the ID information read from the ID area.
Information is recorded only when it is recognized that the address of the sector to which the D area belongs is the address of a predetermined sector, and when reproducing information from the predetermined sector, the ID information read from the ID area and stored in the ID storage means are recorded. Claim No. 1, characterized in that when it is recognized that the address of the sector to which the ID area belongs is the address of a predetermined sector by referring to the information stored in the ID area, the information is reproduced from the sector. 1) The recording/reproducing device described in item 1). (4) When recording information in a predetermined sector of a recording medium in which an ID block including a sector to which this ID area belongs and address information of the next sector is multiple-written in the ID area, the control means is configured to Information is recorded only when the address of the predetermined sector is recognized from a plurality of ID blocks including the ID block in the ID area of the sector, and when information is reproduced from the predetermined sector, information is recorded from any plurality of ID blocks. The recording and reproducing apparatus according to claim 1, wherein information is reproduced when an address of a predetermined sector is recognized. (5) The ID storage means stores the address information of the next sector included in the information read in the ID area of the recording medium in which the sector to which the ID area belongs and the address information of the next sector are recorded in the ID area. A recording/reproducing apparatus according to claim (1), wherein the recording/reproducing apparatus stores: (6) The control means reads the track number and sector number of the sector to which the ID area belongs and the sector number of the next sector from the ID area, and estimates the track number of the next sector from the track number of the current sector. A recording/reproducing apparatus according to claim (5), characterized in that: