JPH03219465A - Method for recording data - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data recording method using a sequential access type data recording/reproducing apparatus using a spiral track such as an optical disk or a magnetic tape as a recording medium.

Conventional technology In the case of a sequential access type data recording and reproducing device that reads out target recorded data according to the recording order, recording of data on a magnetic tape or the like used as the recording medium is as shown in Figure 2. It is done like this.

That is, FIG. 2 is a schematic diagram showing the arrangement of data recorded on the magnetic tape T by the data recording/reproducing apparatus. Each data file F(i-1) F(i), F(i+
1) represents a collection of related data, and between the storage area of each data file and the storage area of the next data file is a storage area of file mark = 2--kM that indicates the separation of these data files. is provided.

Each data file is composed of a plurality of data blocks, each consisting of a data block (hereinafter referred to as a data block) to which error detection/correction parity is added. For example, in the case of data file F(i),
Six data blocks Did, Dil, Di2. Di3
．． Di4. Di5, and are recorded on the magnetic tape T in this order.

In this way, in the above-mentioned general recording method, the next data is sequentially recorded immediately after the previous data without providing a spare area in the middle of the recording area, so that the recorded data in the middle of the magnetic tape T For example, data file F (
Even if an attempt is made to rewrite the data file i') to another data file with the same amount of data, the rewriting may become impossible.

That is, the data file F(i) is rewritten by read-after-write recording, in which data written by a recording head is read by a playback head that follows this head, and it is checked whether the data has been written correctly. When there is a defective area with scratches etc. in part of the recording area of the magnetic tape T, and an error is detected in the data block written to the defective area,
The same data block is rewritten over the defective area, and subsequent data blocks are sequentially written. As a result, the file length of the newly rewritten data file is longer than the file length of the data file F(i) before rewriting by the length of the defective area, and the file mark corresponding to the data file is changed to the next data file. The file F (i+1) will be overwritten.

Therefore, as a conventional data recording method to eliminate such drawbacks, a method is known in which a spare area SP in which nothing is written is provided in the middle of the recording area of the magnetic tape T, as shown in FIG. .

FIG. 3 (1) is a schematic diagram showing the data arrangement on the magnetic tape T before data rewriting, and FIG. 3 (2) is a schematic diagram showing the data arrangement on the magnetic tape T after data rewriting. It is a schematic diagram showing an arrangement.

That is, in the magnetic tape T before data rewriting, a spare area SP is provided every five data blocks, and data file F(i) is separated from another data file F(I) as shown in Figure 3 (2). For example, if the recording area in which data block DII is to be written is a defective area B that has a flaw or the like, and an error is detected in the recording to the defective area B when read by the playback head, the error The detected data block DII is re-recorded in the subsequent spare area SP.

In this way, conventionally, a new data file F(I
) was recorded without overlapping with the next data file F (i+1).

Problem to be Solved by the Invention However, in the case of the data recording method not shown in FIG. The data block DI next to the data block DII is written in the recording area immediately after the defective area B by once reversing the running direction of the data block DI.
Therefore, the running direction of the magnetic tape T must be switched between forward and reverse during recording. Further, a similar operation is necessary when reproducing the recorded data, and therefore there is a problem in that it takes extra time to record or reproduce one data file.

Therefore, an object of the present invention is to provide a data recording method that can continuously record data without changing the recording order back and forth even if a defect is found in the recording area of a recording medium during data rewriting. It is.

Means for Solving the Problems The present invention provides a method for recording data on a recording medium used in a sequential access type data recording/reproducing device that reads out target recorded data according to the recording order, which first records data on the recording medium. Sometimes, for each record of each data file, which is a collection of related data, a file mark is recorded at the beginning of the data file to distinguish the data file from other data files, and the data is not recorded following the data file. A spare area is provided, and if a defective area that causes a recording error on the recording medium is found when rewriting any data file recorded on the recording medium to another data file with the same amount of data, the defect is removed. This data recording method is characterized in that subsequent data is sequentially written from the next recording area of the area so that the writing of the data file falls within the reserve area.

According to the present invention, after the recording area of each data file,
A spare area is provided, and even if a defective area is found on the recording medium when rewriting the data file, subsequent data will be recorded in the correct order from the recording area immediately after the defective area, so the new data file will be stored in the spare area. It is possible to record within a range that does not extend beyond the recording medium, and there is no need to switch and move the recording medium in forward and reverse directions during recording or reproduction.

Embodiment FIG. 1 is a schematic diagram showing the arrangement of data recorded on a magnetic tape 1, which is a recording medium, by a data recording method that is an embodiment of the present invention. Among them, FIG. 1 (1) shows the arrangement of data initially recorded on the magnetic tape 1 on which no data is recorded, and FIG. 1 (2) shows the arrangement of arbitrary data files F recorded on the magnetic tape 1. (i) shows the data arrangement when it is rewritten to another data file F(I) having the same amount of data.

A data recording/reproducing apparatus in which this data recording method is implemented is, for example, a digital audio tape recorder, in which each data file F (i −1>, F (
i), F (i+1> each represents a collection of related data, a spare area SP in which nothing is recorded is provided after the recording area of each data file, and furthermore, that data file and the data file to be recorded next) A file mark M is recorded to distinguish between the two.

Each data file consists of data blocks with parity = 8 for error detection/correction.
Consists of multiple data blocks.

For example, in the case of data file F(i), six data blocks Did, Dil, Di2 . Di3゜Di4. D
i5, and are recorded on the magnetic tape 1 in this order. Here, as the preliminary area SP,
An area for one data block is allocated.

Next, among the data recorded on the magnetic tape 1, an arbitrary data file, for example, data file F(1), is transferred to another data file F(I) having the same amount of data as shown in FIG. 1(2). For example, if the recording area in which data block D1 following data block DIO is to be written is a defective area B that has a flaw, etc., and an error is recorded in the defective area B when reading by the reproducing head. When detected, the data block D in which the error was detected
II is written in the recording area immediately after the defective area, and each subsequent data block DI2 DI3 . DI4. D
I5 is also written in order following data block DII. In this way, the recorded data file F
The file length of file (I) is longer than the data file F(i) before rewriting by the amount recorded by skipping over the defective area, that is, by one data block.

In this way, the new data file F(i) is recorded without overlapping with the next data file F(i+1).

In the above embodiment, an area corresponding to one data block is allocated as the spare area SP, but an area corresponding to a plurality of data blocks may be allocated as the spare area SP.

Effects of the Invention As described above, according to the data recording method of the present invention, when recording data on a recording medium for the first time, a spare area is provided after the recording area of each data file, and when the data file is rewritten, a spare area is provided after the recording area of each data file. Even if a defective area is found on the recording medium, subsequent data is recorded in the correct order starting from the recording area immediately after the defective area, so the new data file will be 0 and within the spare area. In addition to being able to record data, there is no need to switch and move the recording medium in forward and reverse directions during recording or reproduction, and data files can be re-recorded and reproduced in a short time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the arrangement of data recorded on a magnetic tape by a data recording method according to an embodiment of the present invention;
Fig. 2 is a schematic diagram showing the arrangement of data recorded on a magnetic tape using a conventional data recording method, and Fig. 3 is a schematic diagram showing an arrangement of data recorded on a magnetic tape using another conventional data recording method. be. 1...Magnetic tape, F (i-1), F (i)
F(i+1), F(I)...data file, D
iO~Di5. DIO~DI5...data block,
M...File mark, SP...Spare area, B...
defect area

Claims (1)

[Claims] In a data recording method on a recording medium used in a sequential access type data recording and reproducing device that reads out target recorded data according to the recording order, when data is first recorded on the recording medium, related data is read out in accordance with the recording order. For each recording of each data file, which is a collection of When rewriting any data file recorded on the recording medium to another data file with the same amount of data, if a defective area that causes a recording error is found on the recording medium, the data will be rewritten from the recording area next to the defective area. A data recording method characterized by sequentially writing subsequent data so that the writing of the data file fits within a spare area.