JPS60181918A - Data managing system - Google Patents

Abstract

PURPOSE:To improve a discriminating property of a data by using a sector number of a recording sector which starts write, as a block number, in case of writing a data to the next sector of a free sector. CONSTITUTION:In case of recording a data to the next sector SN of an unrecorded sector SN-1, a sector number N of the sector SN is used as its block number. To sections 1-1-1-3 of a write use block number register, the block number is set successively, and in case a sector of the first write destination exists in the next of the unrecorded sector, the sector number N of the sector SN is set to a register 1. Accordingly, at the time of write, a multiplexer 3, first of all, sends out successively the sector number N set to the sections 1-1- 1-3 of the write use register 1, to a modulating circuit and writes it, and subsequently, sends out a transmission data from a host device to the modulation circuit and writes it.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a data management system for optical discs.

In particular, data continuity can be clearly maintained by using the block number of data after an unrecorded sector as the sector number.

[Prior art and its problems]

When recognizing data on an optical disk, blocks are recognized by checking the block number in addition to the sector identification code (SID). In this case, a block number is added to each sector to identify the data block. For example, as shown in FIG. 1, the preformatted 8 ID, block number B No., and user data D of a certain byte length are written in the sector So. The track number and sector number are written in this 8ID, and the block number is in the sector where data is written.
If the data is entered correctly, it is given continuously.

By the way, with optical discs, at the time of writing,! The written data is checked and if there is an uncorrectable error in the written data, a defective mark is added and the data is rewritten using the next sector. In the case of magnetic disks, a defective sector is flagged as a defective sector and the correct data is written by jumping to a replacement sector on a replacement track, but with optical disks, errors are more likely to occur, and the replacement is replaced each time an error occurs. Since the write operation becomes slow when jumping to a sector, when a bad sector exists, the next sector is used. If the sector Sl is a defective sector in FIG. 1, the data written in the sector S1 is rewritten into the next sector S2. If the block number of a defective sector S is BN, then the block number BN and a defective mark NG are written in the data area. In this case, the block number of the ninth sector S is set to BN1, which is the same as the block number of the defective sector S1, to maintain block continuity.

By the way, when writing data to conventional optical discs.

When writing data next to an empty sector, a new block number is written sequentially starting from 0 for each write command. That is, sector S as shown in the $2 diagram. -8
After writing data up to n.

When data is written from sector s'o by another write command, the block number of sector sQ is set to 0 and successively determined as 1, 2, and so on. Therefore, even if you know that the block number is 0 and has become a small number, if the previous block number is small and the next free space is also short, for example, in sector S:, change the block number BN1-rIJ. When the data is read out, it cannot be determined whether it is the expected correct block or the data just before it, and the reliability of identifying the data block is low.

[Purpose of the invention]

The purpose of the present invention is to improve these drawbacks.

An object of the present invention is to provide a data management system in which, when writing data next to a vacant sector, the sector number of the recording sector in which writing of the data is started is used as a block number. Here, the sector number is a number that uniquely corresponds to all sectors on the disk. In other words, every sector has a different sector number than other sectors.
It is added to the ID.

[Structure of the invention]

In order to achieve this purpose, the data management method of the present invention:
In a data management system in which a block number is added together with data to a disk medium to which a sector number is added, a write block number holding means is provided in which a block number to be omitted is set.

When data does not exist in a sector before a recording sector, the sector number of this recording sector is set as a block number in the write block number holding means, and a block number of a subsequent recording sector is assigned based on the block number. It is characterized by the following.

[Embodiments of the invention]

Before describing the present invention in detail based on one embodiment, its outline will be explained with reference to FIG. In the present invention, unrecorded sector 5
When recording data in sector SN following N-1, sector number N of sector 8N is used as the block number. Therefore, if there is no bad sector, sector 8N+11
In 8N+2..., the block number is N+1. N+2...
・It becomes. Therefore, the sector 8M+ before the unrecorded sector
Even if the SMI block number is L+1, sector 8
In H, Ss++ rivers, block numbers N, N+1, etc., which are usually different from L+1, can be used, so even if the number of unrecorded sectors is small and L+1 is a small number, it can be clearly distinguished from these. .

An embodiment of the present invention will be described with reference to FIG. In FIG. 4, 1 is the write block number register, which is classified as 1.
It is divided into -1 to 1-3. A path for the 2° 2' microwave setter, 3 is a multiplexer.

Division of write block number register 1-1゜1-2.
Block numbers (3-byte information) to be recorded in the data writing destination sector are sequentially set in 1-3. If the sector to which data is first written is located next to an unrecorded sector, such as sector SN in Figure 3, the processor is aware of this, so the write block number register is set to sector sN. Set sector number N.

Therefore, when writing data to an optical disc.

When the write head is located at the write destination, the multiplexer 3 first selects sections 1-1, 1-2, .
The block numbers 1 to 3 set to 1-3, that is, the sector number N, are sequentially sent to the modulation circuit and written therein.Next, the transmission data from the host device is sent to the modulation circuit and written therein. For the next sector SN+1, the microprocessor increments the contents of the write block number register by 1. In this way sector 8N+ 8N+1
+ ”Ni1...K is block number N, N+1, N
+2... will be entered sequentially.

By the way, when there is an uncorrectable error in the data written to sector SN+1, the processor controls to retransmit the block number N+1 set in the write block number register as the block number for sector SS+V. As a result, the same block number as the previous sector SN+1 is written in sector SN+1, and sector SN
It can be seen that +1 is a bad sector.

Next, when reproducing the data recorded in this way, the fifth
A lead circuit as shown in the figure is prepared.

In FIG. 5, the read data output from the read amplifier is demodulated by a demodulation circuit 10. This demodulated data is set in the first sector buffer 12-1 of the sector buffer 12 via the shift register 11. This data is then checked by the ECC circuit 15, and if an error exists, the corrected data is sent out, and the data set in the first sector buffer 12-1 is corrected by the correcting circuit 14, and this accurate data is used for transfer. It is output to the higher-level device via the buffer. While error checking is being performed on the data set in the first sector buffer 12-1 in this manner, the data of the next sector is set in the second sector buffer 12-2 and subjected to an ECC check.

By the way, the block number data (3-byte information) in the data output from the correction circuit 14 is in the section 15-1, 15-2, 15-3 of the read block number register 15.
are set sequentially, and the block number is checked to see if it is as expected.

By the way, when an unrecorded sector exists, a dropout signal is present at the output of the read amplifier, so this dropout signal is detected by the unrecorded section detection circuit 16, and the detection of an unrecorded sector is reported to the processor. outputs an unrecorded detection signal. As a result, the processor stops setting data, etc. to the sector buffer 12.

When data is detected again, the processor recognizes that the data is in the sector next to the unrecorded sector, determines that the block number is consecutive from that sector number, and sets it in each section of the read register 15. The sector number is used as the expected value of the block number. Based on this, it is checked whether the continuity of the data set in these sections is maintained, and it is determined whether the reproduced data is the expected data.

〔Effect of the invention〕

According to the present invention, when there is no data in the sector before a recording sector, the block numbers of the subsequent recording sectors are continuous using the sector number of the recording sector as the block number. Unlike the case where a block number is always assigned starting from zero when a recording sector exists next to a recording sector, the same block number does not appear at short sector intervals. Therefore, the identifiability of data can be improved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the data format of an optical disc, Fig. 2 is a conventional data format, Fig. 3 is a data format based on the present invention, Fig. 4 is a configuration diagram of an embodiment of the present invention, and Fig. 5 is a diagram of the present invention. This is an example of a read circuit for reproducing written data based on the invention. In the figure, 1 is the write block number register, 2゜2' is the microprocessor number, 6 is the multiplexer, 1
0 is a demodulation circuit, and 11 is a shift register. 12 is a sector buffer, 14S is an error check/correction (ECC) circuit, and 14 is a correction circuit. Reference numeral 15 indicates a read program number register, and reference numeral 16 indicates an unrecorded portion detection circuit. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Scope of Claims] In a data management method in which a block number is added together with data to a disk medium to which a sector number has been added, a write block number holding means is provided in which a block number to be written is set, and When there is no data in the write sector, the sector number of this recording sector is set as a block number in the write block number holding means. A data management method characterized in that a block number of a subsequent recording sector is assigned based on the block number.