JPH0778965B2 - Data recording method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method by a sequential access type data recording / reproducing apparatus having a spiral track such as an optical disc or a magnetic tape as a recording medium.

2. Description of the Related Art In the case of a sequential access type data recording / reproducing apparatus which reads out target recording data according to a recording order, recording of data on a magnetic tape or the like used as its recording medium is generally performed as shown in FIG. To be done.

That is, FIG. 7 is a schematic diagram showing an array 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 a recording area of a file mark M indicating a delimiter of these data files is provided between the recording area of each data file and the storage area of the next data file. .

Each data file is composed of a plurality of data blocks, each having a block of data (hereinafter referred to as a data block) to which error detection / correction parity is added as a constituent element. For example, in the case of data file F (i),
It is composed of six data blocks Di0, Di1, Di2, Di3, Di4, Di5, and is recorded on the magnetic tape T in this order.

As described above, in the general recording method described above, the next data is packed immediately after the previous data and sequentially recorded without providing a spare area in the middle of the recording area. For example, data file F
Even if (i) is rewritten to another data file having the same data amount, the rewriting may not be possible.

That is, the rewriting of the data file F (i) is performed by the read-after-write recording in which the data written by the recording head is read by the reproducing head following this head and whether or not the data is correctly written is checked. At this time, if there is a defective area having a defect in a part of the recording area of the magnetic tape T and an error is detected in the data block written in the defective area, the same data block is skipped over the defective area. Is rewritten again, and subsequently, subsequent data blocks are sequentially written. As a result, the file length of the newly rewritten data file becomes longer than the file length L of the data file F (i) before rewriting by the defective area, and the file mark M corresponding to that data file has the next data. It will be overwritten on the file F (i + 1).

Then, as a conventional data recording method for solving such a drawback, there is known a method of providing a spare area SP in which nothing is written in the recording area of the magnetic tape T as shown in FIG. .

FIG. 8 (1) is a schematic diagram showing the arrangement of data on the magnetic tape T before data rewriting, and FIG. 8 (2) is a schematic showing the arrangement of data on the magnetic tape T after data rewriting. It is a figure.

That is, in the magnetic tape T before data rewriting, the spare area SP is provided every 5 data blocks, and the data file F (i) is replaced with another data file F (I) as shown in FIG. 8 (2). In the case of rewriting to, for example, when the recording area in which the data block DI1 is to be written is a defective area B having a flaw or the like and an error is detected in the recording in the defective area B by reading with the reproducing head, the error is detected. The detected data block DI1 of is re-recorded in the subsequent spare area SP.

Thus, in the conventional data recording method, the new data file F (I) is the next data file F (i +
It was recorded without overlapping with 1).

However, in the data recording method shown in FIG. 8 described above, for example, the data file F that was originally recorded is
Data file F (I) having a larger data amount than (i)
When re-recording the data file F (i), the file mark M following the recording area of the data file F (i) to be rewritten and the recording area of the data file F (i + 1) are also rewritten. The following problems occur even if (i + 1) is unnecessary data.

That is, in the data file F (i + 1) next to the data file F (i) to be rewritten, the old data that cannot be rewritten into the new data file F (I) remains, and thus the rewritten data file F (I). When reproducing, the unnecessary old data is also read, and eventually the data file F (I) cannot be used. That is, when the data file F (I) is read, by referring to the directory at the beginning of the magnetic tape T in which the position of the data file, the number of data blocks, etc. are recorded as a recording area for searching each data file, The control is performed so that the remaining old data is not read, but if the directory cannot be read due to a flaw or the like, unnecessary old data is read and a new data file F (I) cannot be used after all.

Therefore, an object of the present invention is to provide a data recording method capable of rewriting data in a reproducible manner even when the data amount of a new data file to be rewritten is larger than that of the data file before rewriting. 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 apparatus for reading target recording data according to a recording order, when recording data on the recording medium, For each recording of each data file composed of a plurality of data blocks in which data is to be recorded, a file mark for distinguishing the data file from other data files is recorded between the data files and recorded on the recording medium. When rewriting an arbitrary data file that has been written to another data file that has a larger amount of data than this data file, the data that exceeds the area of the data file before the rewriting is the first file mark and the data adjacent to the rear. Continue writing to the data block where the file existed A file mark is recorded between the another data file and a residual data block that cannot be rewritten in the data file that follows it, and the residual data block is rewritten to a new data file that has no recording. Is a data recording method.

Further, according to the present invention, in a data recording method for a recording medium used in a sequential access type data recording / reproducing apparatus for reading target recording data according to a recording order, when recording data on the recording medium, the data should be recorded. For each recording of each data file composed of a plurality of data blocks, a file mark for distinguishing the data file from other data files is recorded between the data files, and any data recorded on the recording medium is recorded. When rewriting a file to another data file that has a larger amount of data than this data file, the data block that exceeds the area of the data file before rewriting is the data block where the first file mark and the data file adjacent to the rear existed. , And write the data The rewritten without region-yl, which is a data recording method characterized by rewriting the recording without spare area that comes to write the obtained new data file.

Operation According to the present invention, the data file F (i) to be rewritten
If the next data file F (i + 1) of is an unnecessary data file, the rewriting target data file F
Data file F (I) having a larger data amount than (i)
From data file F (i) to data file F (i +
In the data file F (i + 1), the recording area in which the old data remains without being rewritten can be rewritten over 1), and the recording area is a spare area with no recording attached to the new data file F (I) or no recording area. Since it is rewritten as another data file, unnecessary old data is not read during reproduction, and the rewritten data file F (I) can be read correctly.

Embodiment FIG. 1 is a block diagram showing a schematic configuration of a data recording / reproducing apparatus for carrying out the data recording method of the present invention.
The writing / reading circuit 1 is a circuit including a rotating drum 2, amplifiers 3 and 4, etc., and is a recording medium with recording heads W1 and W2 and reproducing heads R1 and R2 arranged on the peripheral surface of the rotating drum 2. A magnetic tape T is sequentially scanned, and the recording head W
It has a function of sequentially recording data on the magnetic data T by scanning 1, W2, and reading the recorded data on the magnetic tape T by scanning of the reproducing heads R1, R2. The signal processing circuit 5 has a function of converting data input from the outside into a signal suitable for recording and giving the signal to the writing / reading circuit 1, and the data read from the magnetic tape T by the writing / reading circuit 1 before recording. It is a circuit having a function of converting into a signal and outputting. The control circuit 6 is a circuit for controlling the operation timing and the like of the write / read circuit 1 and the signal processing circuit 5.

FIG. 2 is a schematic diagram showing an array of data recorded on the magnetic tape T by the data recording method according to the embodiment of the present invention. Of these, FIG. 2 (1) shows the arrangement of the data recorded first on the magnetic tape T on which no data is recorded, and FIG. 2 (2) shows the arbitrary data recorded on the magnetic tape T. The data array when the file F (i) is rewritten to another data file F (I) having a larger data amount than this is shown.

FIG. 3 is a flow chart showing the procedure of the data recording method of this embodiment. The data recording method of this embodiment will be described with reference to FIG.

First, in the data recording operation of FIG.
Following the start of n1, in step n2, a data file is first recorded on the unrecorded magnetic tape T as shown in FIG. That is, the data processed by the signal processing circuit 5 is sequentially written on the magnetic tape T by the recording heads W1 and W2 of the rotary drum 2 in the writing / reading circuit 1. At this time, each data file F (i-1), F (i), F (i is recorded on the magnetic tape T as shown in FIG.
+1) represents a collection of related data.

Each data file is composed of a plurality of data blocks, with the data block to which error detection / correction parity is added as a constituent element. For example, in the case of the data file F (i), it is composed of three data blocks Di0, Di1, Di2, but here, these data recording areas are followed by a spare area SP with no data recording for three data blocks. It is added as an area attached to (i).

Following the recording of one data file, the next step n3
Then, a file mark M that distinguishes the data file from the data file to be recorded next is recorded.
Whether or not all the data files have been recorded is confirmed by the judgment of step n4, and when it is judged that the recording has not been completed, the operations of steps n2 and n3 are repeated, whereby each data file is recorded on the magnetic tape T. F (i-1), F
(I), F (i + 1), ... Are recorded sequentially. If it is determined in step n4 that all the data files have been recorded, the process moves to step n5, and the recording operation ends.

Next, in the data rewriting operation of FIG. 3 (2), among the recording data of the magnetic tape T, an arbitrary data file, for example, a data file F (i) is transferred to a data file F (i) as shown in FIG. 2 (2). Re-recording is performed by rewriting to another data file F (I) having a large amount of data. At this time, it is assumed that the next data file F (i + 1) is unnecessary,
Data file F (I) to be rewritten is 8 data blocks DI
It shall consist of 0 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 one data block D of the next data file F (i + 1) are rewritten.
New data files F (I) are sequentially written over the recording area of (i + 1), 0. That is, also in this case, the data to be written is processed by the signal processing circuit 5 and sequentially written on the magnetic tape T by the recording heads W1 and W2 of the writing / reading circuit 1.

At the next step n8, the next data file F (i + 1)
1 data block D that remains without being rewritten in
An area in which (i + 1), 1 is rewritten to the file mark M and the remaining 1 data block D (i + 1), 2 is not recorded
Rewritten to NR. As a result, a new data file F
After (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 is ended in step n9.

In this way, when re-recording the new data file F (I), the old data is processed so as not to remain, so that unnecessary old data is read when the new data file F (I) is read. Therefore, the rewritten data file F (I) can be effectively used.

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

FIG. 5 is a flow chart showing the procedure of the data recording method of this embodiment. The data recording method of this embodiment will be described with reference to FIG.

Following the start of step n1, in step n2, a data file is first recorded on the unrecorded magnetic tape T as shown in FIG. That is, the signal processing circuit 5
The data processed in (1) is sequentially written on the magnetic tape T by the recording heads W1 and W2 of the rotary drum 2 in the writing / reading circuit 1. At this time, each data file F (i- is recorded on the magnetic tape T as shown in FIG.
1), F (i), F (i + 1) represent a collection of related data.

Each data file is composed of a plurality of data blocks, with the data block to which error detection / correction parity is added as a constituent element. For example, in the case of the data file F (i), it is composed of three data blocks Di0, Di1, Di2, but here, these data recording areas are followed by a spare area SP with no data recording for three data blocks. It is added as an area attached to (i).

Following the recording of one data file, the next step n3
Then, a file mark M that distinguishes the data file from the data file to be recorded next is recorded. It is determined in step n3 whether or not recording of all data files has been completed, and the operations of steps n2 and n3 are repeated until the completion is confirmed, so that each data file F (i-1) is recorded on the magnetic tape T. ), F (i), F (i +
1), ... Are recorded in sequence.

In the next steps n5 and n6, among the recorded data on the magnetic tape T, an arbitrary data file, for example, the data file F (i) is transferred to another data file having a larger data amount as shown in FIG. 4 (2). Rewriting to rewrite the file F (I) is performed. At this time, the next data file F (i
The data file F (I) to be rewritten is assumed to be composed of 8 data blocks DI0 to DI7.

First, in step n5, the data file F before rewriting
(I), file mark M and next data file F
New data files F (I) are sequentially written over a part of the recording area of (i + 1). That is, also in this case, the data to be written is processed by the signal processing circuit 5 and sequentially written on the magnetic tape T by the recording heads W1 and W2 of the writing / reading circuit 1.

At the next step n6, the next data file F (i + 1)
, The remaining data blocks that have not been rewritten are rewritten to the spare area SP, and the rewritten spare area SP and the remaining unrewritten spare area SP are defined as areas attached to the new data file F (I). It As a result, the old data does not remain in the new data file F (I).
At the next step n7, the data recording process is completed.

In this way, since the old data is processed so as not to remain in the reproduction / recording of the new data file F (I), unnecessary old data is read when the new data file F (I) is read. Therefore, the rewritten data file F (I) can be effectively used.

In each of the above-described embodiments, the data file to be recorded on the magnetic tape T first has the data block followed by the spare area.
Although the case where the SP is provided has been described, the re-recording can be performed in the same manner even when the spare area SP is not added to the data file to be recorded first. However, if a spare area SP is added to the data file to be recorded first, the new data file will be within the range of the spare area SP when rewriting to a data file with a larger data amount than the data file before rewriting. If the data area is within the range, it is advantageous in that re-recording can be performed without destroying the next data file.

In the above-mentioned embodiment, one data block is applied as the file mark M, but as another embodiment of the present invention, as shown in FIG. End of data)
May be represented as a flag (actually, it does not occupy the area). As a result, it is not necessary to use a particularly large area as the file mark, and the file mark M can be handled as one 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 data amount than the data file F (i) to be rewritten is transferred from the data file F (i) to the data file F (i). The recording area of the data file F (i + 1) that has been rewritten over (i + 1) and the old data remains without being rewritten is a spare area with no recording attached to the new data file F (I) or another data without recording. Since the file is rewritten as a file, the rewritten data file F (I) can be correctly read without reading unnecessary old data during reproduction.

Further, according to the present invention, it is not necessary to refer to the directory at the beginning of the magnetic tape, and it is not necessary to provide a directory, so that new data can be read and reproduced, and the control is simple. The effect is also
To be achieved.

[Brief description of drawings]

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 recorded on a magnetic tape by the data recording method according to one embodiment of the present invention. FIG. 3 is a schematic diagram showing the arrangement of data, FIG. 3 is a flow chart showing the procedure of the data recording method, and FIG.
FIG. 6 is a schematic diagram showing an 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 flow chart showing the procedure of the data recording method, and FIG. FIG. 7 is a schematic diagram showing the arrangement of data of another embodiment, FIG. 7 is a schematic diagram showing the arrangement of data recorded on a magnetic tape by a conventional data recording method, and FIG. 8 is a magnetic diagram by another conventional data recording method. It is a schematic diagram which shows the arrangement | sequence of the data recorded on the tape. T: Magnetic tape, F (i-1), F (i), F (i +
1), F (I), F (I + 1) ... Data file, Di0 to D
i2, DI0 to DI7 ... Data block, M ... File mark, SP ... Spare area, NR ... Unrecorded area

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hidenori Minoda 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within Sharp Corporation (72) Inventor Takeshi Tanaka 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Incorporated (72) Inventor Shuzo Nishida 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Sharp (56) References JP-A-51-43908 (JP, A) JP-A-60-47268 (JP) , A)

Claims (2)

[Claims] 1. A data recording method for a recording medium used in a sequential access type data recording / reproducing apparatus for reading target recording data according to a recording order, when the data is recorded on the recording medium, the data should be recorded. For each recording of each data file composed of a plurality of data blocks, a file mark for distinguishing the data file from other data files is recorded between the data files, and any data recorded on the recording medium is recorded. When rewriting a file to another data file that has a larger amount of data than this data file, the data block that exceeds the area of the data file before rewriting is the data block where the first file mark and the data file adjacent to the rear existed. Write to the other data file And a residual data block that cannot be rewritten in the data file after that, a file mark is recorded between the residual data block and the residual data block, and the residual data block is rewritten to a new data file that does not have data recorded. Recording method. 2. A data recording method for a recording medium used in a sequential access type data recording / reproducing apparatus for reading target recording data according to a recording order, when the data is recorded on the recording medium, the data should be recorded. For each recording of each data file composed of a plurality of data blocks, a file mark for distinguishing the data file from other data files is recorded between the data files, and any data recorded on the recording medium is recorded. When rewriting a file to another data file that has a larger amount of data than this data file, the data block that exceeds the area of the data file before rewriting is the data block where the first file mark and the data file adjacent to the rear existed. And write the data Data recording method characterized by rewriting rewritten without region Le, the recording without spare area that is included with the rewritten new data file.