JPH041978A - Data recording method - Google Patents

Abstract

PURPOSE:To read no undesired old data at reproduction by rewriting a recording area including the unrewritten old data among the data files into an unrecorded spare area belonging to a new data file or another unrecorded data file. CONSTITUTION:When the data are recorded first into a recording medium, a file mark M is recorded for discrimination from other data files every time a data file F(i) is recorded. When an optional file F(i) to be recorded is rewritten into another data file F(I) of a larger quantity of data, the data overflowing an area of the unrewritten file F(i) are continuously written into the area of a data file F(i+1) adjacent to the mark M or the next file. Furthermore an unrewritten area is rewritten into an unrecorded spare area SP belonging to a rewritten new data file. Thus the rewritten data file F(I) is correctly read without reading the undesired old data at reproduction.

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 7. It is done like this.

That is, FIG. 7 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) each represents a collection of related data, and between the recording area of each data file and the storage area of the next data file is a recording area of file mark M indicating the separation of these data files. .

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 DiO, Dil, Di2. Di3
．． Di4 and 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(i
) to another data file with the same amount of data, the rewriting may not be possible.

That is, the data file F(i) is rewritten by read-after-write recording, in which the data written by the recording head is read by the 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 written over the defective area. is rewritten again, followed by subsequent data blocks being written sequentially. As a result, the file length of the newly rewritten data file becomes longer than the file length of the data file F(i) before rewriting by the amount of the defective area, and the file mark M corresponding to the data file becomes longer than the file length of the data file F(i) before rewriting. 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. 8 (1) is a schematic diagram showing the data arrangement on the magnetic tape T before data rewriting, and FIG. 8 (2) is a schematic diagram showing the data arrangement on the magnetic tape T after data rewriting. It is a diagram.

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 FIG. 8(2). For example, when the recording area to which data block D41 is to be written is a defective area B that has a flaw, etc., 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, in the conventional data recording method, the new data file F(I) is created by the next data file F(i+
1) was recorded without overlapping.

Problems to be Solved by the Invention However, in the data recording method shown in FIG. 8 described above, for example, the data file F (
When attempting to re-record data file F(I) with a larger amount of data than i>, the recording area of file mark M and data file F(i+1) following the recording area of data file F(i) to be rewritten is also However, even if the next data file F(i+l) is unnecessary data, the following problem occurs.

In other words, in the data file F (i+1) next to the data file F (i) to be rewritten, the old data that cannot be rewritten to the new data file F (I) remains as is, so the rewritten data file F (I) When reproducing the data file F(I), unnecessary old data is also read, resulting in a situation where the data file F(I) becomes unusable.

In other words, when reading a data file F(I), a magnetic chip I is used as a recording area for searching each data file, in which the position of the data file, the number of data blocks, etc. are recorded.
By referring to the directory at the beginning of T,
Control is performed so that the remaining old data is not read, but if there is a defect in the directory and the data cannot be read, unnecessary old data will be read and a new data file F (I) eventually becomes unusable.

Therefore, an object of the present invention is to provide a data recording method that can rewrite data reproducibly even when the amount of data in a new data file to be rewritten is larger than that in the data file before 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 recording of each data file that is a collection of related data, a file mark is recorded to distinguish that data file from other data files, and any data file that is completely recorded on the recording medium is When rewriting to another data file with a larger amount of data than this data file, the data that protrudes from the area of the data file before rewriting is continuously written to the file mark and the area of the adjacent data file, and the data after that Rewrite the unwritten area of the file to a new data file with no records, or rewrite the unwritten area of the subsequent data file to a spare area with no records attached to the new rewritten data file. This data recording method is characterized by:

Effect According to the present invention, data file F(i) to be rewritten
If the next data file F (i+1) is an unnecessary data file, the data file F to be rewritten is
Data file F(1) with a larger amount of data than (i)
from data file F(i) to data file F(i+
1), and the recording area of the data file F(i+1) where old data remains without being rewritten is used as a spare area with no records attached to the new data file F(I>) or a recording area of the new data file F(I>). Since the data file F (I) is rewritten as a separate data file, the rewritten data file F (I) can be read correctly without reading unnecessary old data during playback.

Embodiment FIG. 1 is a block diagram showing a schematic configuration of a data recording/reproducing apparatus in which the data recording method of the present invention is implemented.

The write/read circuit 1 includes a rotating drum 2, an amplifier 3.4
A circuit including recording heads Wl, W2 and a reproducing head R arranged on the circumferential surface of the rotating drum 2.
1. Sequentially scan the magnetic tape T, which is a recording medium, with R2,
Recording head w1. It has a function of sequentially recording data on the magnetic tape T by scanning w2 and reading recorded data on the magnetic tape T by scanning the reproducing heads R1 and R2.

The signal processing circuit 5 converts data input from the outside into a signal suitable for recording, performs the above-mentioned writing/reading circuit 1, and writes/reads the magnetic tape T by the writing/reading circuit 1.
This circuit has the function of converting the data read from the data into a pre-recording signal and outputting the signal. The control circuit 6 performs the above writing/
This is a circuit for controlling the operation timing of the reading circuit 1 and the signal processing circuit 5.

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

FIG. 3 is a flowchart showing the procedure of the data recording method of this embodiment. The data recording method of this embodiment will be explained with reference also to FIG.

First, in the data recording operation shown in FIG. 3(1), following the start of step n1, a data file is first recorded on the unrecorded magnetic tape T in step n2, as shown in FIG. 2(1). That is, the data processed by the signal processing circuit 5 is sequentially written onto the magnetic tape T by the recording heads Wl, W2 of the rotating drum 2 in the write/read circuit 1. At this time, the magnetic tape T is shown in Fig. 2 (1).
Each data file F(i-1) is recorded as follows.

F (i) and F (i+1> each represent a collection of related data.

Each data file is composed of a plurality of data blocks including data blocks to which parity for error detection/correction is added. For example, in the case of data file F(i), three data blocks Did, Dil
, Di2, but here, following these recording areas, a spare area SP with no recording for three data blocks is added as an area attached to the file data F(i).

Following the recording of one data file, in the next step knob n3, a -k M is recorded in a file that distinguishes that data file from the data file to be recorded next. It is determined in step n4 whether all data files have been recorded, and if it is determined that recording has not been completed, step n2. Repeat the operation of n3 L
, so that each data file F is stored on the magnetic tape T.
(il), F (i), F (i-1-1), . . . are recorded sequentially. Further, when it is determined in step n4 that all data files have been recorded, the process moves to step n5 and the recording operation ends.

Next, in the data rewriting operation shown in FIG. 3(2), any data file such as data file F(i) among the data recorded on the magnetic tape T is changed from this as shown in FIG. 2(2). Rewriting is performed to rewrite to another data file F(I) with a large amount of data. At this time, it is assumed that the next data file F(i+1) is unnecessary,
The data file F(I) to be rewritten is 8 data blocks D
It is assumed that it is composed of IO to DI7.

First, the operation is started in step n6, and in step n7, the data file F(i) before rewriting, the file mark M, and the recording area of one data block D(i+1), O of the next data file F(i+1) are rewritten. , new data files F(I) are sequentially written. That is, also in this case, the data to be written is processed by the signal processing circuit 5 and sequentially written onto the magnetic tape T by the recording heads Wl, W2 of the write/read circuit 1.

In the next step n8, the next data file F(i+1
), one data block D(i+1>, 1 that remains unwritten) is rewritten to a file mark M, and the remaining one data block D(i+1), 2 is rewritten to an unrecorded area NR. As a result, Next to the new data file F (I>, another data file F(I+1) consisting of an unrecorded area NR for one data block and a spare area SP for three data blocks will be recorded. After this, the data recording process ends at step n9.

In this way, when re-recording the new i-tough file F(T), processing is performed so that no old data remains, so when reading this new data file F(I), unnecessary old data is not read. Therefore, the rewritten data file F(I) can be used effectively.

FIG. 4 is a schematic diagram showing the arrangement of data recorded on the magnetic tape T by a data recording method according to another embodiment of the present invention. Among them, FIG. 4 (1) shows the arrangement of data initially recorded on the magnetic tape T on which no data is recorded, and FIG. 4 (2) shows the arrangement of arbitrary data recorded on the magnetic tape T. It shows the data arrangement when file F(i) is rewritten to another data file F(I) with a larger amount of data.

FIG. 5 is a flowchart showing the procedure of the data recording method of this embodiment. The data recording method of this embodiment will be explained with reference also to FIG.

Following the start of step n1, a data file is first recorded on the unrecorded magnetic tape T in step n2, as shown in FIG. 4(1). That is, the signal processing circuit 5
The processed data is sequentially written onto the magnetic tape T by the recording head w1w2 of the rotary drum 2 in the write/read circuit 1.
Each data file F(i-
1) F (i) and F (i+1) each represent a collection of related data.

Each data file is composed of a plurality of data blocks including data blocks to which parity for error detection/correction is added. For example, in the case of data file F(i), three data blocks Did, Dil
, Di2, but here, following these recording areas, a spare area SP with no recording for three data blocks is added as an area attached to the file data F(i).

Following the recording of one data file, the next step n
3, a file mark M is recorded to distinguish that data file from the next data file to be recorded.

In step n3, it is determined whether or not recording of all data files has been completed, and by repeating the operations of steps n2n3 until completion is confirmed, each data file F (i-1>, F (
i).

F(i+1>, . . . are recorded sequentially.

Next step n5. At n6, any data file, for example data file F(i), out of the data recorded on the magnetic tape T is transferred to another data file F(I) having a larger amount of data as shown in FIG. 4(2). Re-recording is performed to rewrite the data.

At this time, it is assumed that the next data file F(i+l) is unnecessary, and the data file F(I) to be rewritten is composed of eight data blocks DIO to DI7.

First, in step n5, the data file F before rewriting is
(i), file mark M and next data file F
A new data file F(1) is sequentially written across some recording areas of (i+1). That is,
In this case as well, the data to be written is processed by the signal processing circuit 5 and written.'The recording head Wl of the reading circuit 1,
The data are sequentially written onto the magnetic tape T by W2.

In the next step n6, the next data file F(i+1
), the data blocks remaining without being rewritten are rewritten to the spare area SP, and the rewritten spare area SP
The spare area SP remaining without being rewritten is made into an area attached to the new data file F(1). As a result, no old data remains in the new data file F(I).

In the next step n7, all data recording processing is completed, and when re-recording the new data file F(I), processing is performed so that no old data remains, so this new data file F(I) ), unnecessary old data will not be read, and therefore the rewritten data file F(I> can be used effectively.

In each of the above embodiments, a case has been described in which a spare area SP is provided following a data block in a data file to be recorded on the magnetic tape T for the first time. Even if you do not add , you can re-record in the same way. However, if a spare area SP is added to the data file to be recorded for the first time, when rewriting the data file to a data file with a larger amount of data than the data file before rewriting, the new data file will be added to the spare area SP. A data area that falls within this range is advantageous in that it can be rerecorded without destroying the next data file.

In the above embodiment, the entire data block is applied as the file mark M, but in another embodiment of the present invention, as shown in FIG. end of data)
It may also be represented as a flag (which actually occupies no space).

As a result, there is no need to use a particularly large area for file marks;
It can be treated as a data block.

Effects of the Invention As described above, according to the data recording method of the present invention, the data file F(I) having a larger amount of data than the data file F(i> to be rewritten) is transferred from the data file F(i) to the data file F(i). (i+1), and the recording area of data file F(i+1) where old data remains without being rewritten is a new data file F(I).
Since the data is rewritten as a spare area with no records attached to it or as a separate data file with no records, the rewritten data file F(I) can be read correctly without reading unnecessary old data during playback. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a data recording/reproducing apparatus in which the data recording method of the present invention is implemented, and FIG. 2 is a block diagram showing the general configuration of a data recording/reproducing apparatus in which the data recording method of the present invention is implemented. Fig. 3 is a schematic diagram showing the data arrangement; Fig. 3 is a flowchart showing the procedure of the data recording method;
The figure is a schematic diagram showing the arrangement of data recorded on a magnetic tape by a data recording method according to another embodiment of the present invention.
FIG. 5 is a flowchart showing the procedure of the data recording method, FIG. 6 is a schematic diagram showing the data arrangement of another embodiment of the present invention, and FIG. 7 is a data recording method recorded on a magnetic tape by the conventional data recording method. FIG. 8 is a schematic diagram showing the arrangement of data recorded on a magnetic tape by another conventional data recording method. T...magnetic tape, F (i-1), F (i),
F(i+1), F(I), F(I+1)...data file, DiO to Di2. DIO to DI7...Data block, M...File mark, SP/reserve area, NR...Unrecorded area Agent Patent attorney Number of strokes Keiichi Figure (2) Figure 5

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 record of each data file, which is a collection of When rewriting to another data file with a large amount of data, the data that protrudes from the area of the data file before rewriting is continuously written to the file mark and the area of the adjacent data file, so that the data file after that cannot be rewritten. It is characterized by rewriting the area into a new data file with no records, or rewriting the area that cannot be rewritten in the subsequent data file into a spare area with no records attached to the rewritten new data file. data recording method.