JPH05128807A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily retrieve a file by using a retrieving pattern by forming a recording track in the length-wise direction of a magnetic tape and recording the retrieving pattern to the recording track in correspondence to the control data of the head of a tape. CONSTITUTION:At the time of recording, a system control circuit 24 outputs to a retrieving data generating circuit 50 and generates a reference signal TREC for retrieval. This signal is followed by the retrieving pattern recording and the retrieving information in correspondence to a file information table FIT of an instruction information track area is recorded. The system control circuit 24 prepares a tape mark track TM at the head of a file at the time of the recording. The control circuit 24 updates the FIT for every updating and recording of the file. The control circuit 24 sends a control signal to a recorder, fetches a reproducing signal TPB of a recording track TC into a retrieving pattern detecting circuit 52 and switches the recorder to reproduction. Further, the signal is fetched into a decoder 54, the coincidence of a tape mark ID and the table FIT is investigated, and at the time of the non-coincidence, a control signal CONT is outputted, and a continuous pattern is detected. Even at the time of losing the leading information for control, the access can be performed to the desired file.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 11 and 12) Problems to be Solved by the Invention (FIGS. 11 and 12) Means for Solving the Problems (FIGS. 8 and 11) Actions (FIGS. 8 and 11) ) Example (1) Overall configuration (FIGS. 1 to 7) (2) Search data (FIGS. 8 to 10) (3) Effect of example (4) Other example effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and can be applied to, for example, an external storage device of a computer.

[0003]

2. Description of the Related Art Conventionally, in this type of magnetic recording / reproducing apparatus, recording tracks are sequentially formed on a magnetic tape at an angle.
A so-called ID-1 format data recorder has been proposed which is capable of recording and reproducing desired data at high density (ANSI x3.175-1990 19mm Type ID-1 Recorded
Instrumentation).

That is, as shown in FIG. 11, in this type of data recorder, the magnetic tape 1 is wound around a rotary drum which rotates at a predetermined speed, and the magnetic tape 1 is run at a predetermined speed to cause the rotary drum to rotate. Recording tracks TR (TR)
1, TR2, TR3, TR4, TR1, TR2, ...)
And the desired data is recorded in the recording track TR1. Furthermore, at this time, the data recorder
Recording tracks TA, CTL, and TC extending in the longitudinal direction are formed on the upper and lower ends of the magnetic tape 1, and the recording tracks CT are formed.
The track set ID of the recording track TR is recorded in L.

Here, the track set ID is absolute position information starting from the beginning of the magnetic tape 1 and is sandwiched between predetermined sync signals and recorded in the recording track TR in four track cycles. There is. Further, the recording tracks TA and TC are adapted to record user management data and the like, whereby the recording tracks TA and C are recorded.
By reproducing TL and TC, it is possible to easily search the data recorded at high density in the recording track TR.

Further, in the data recorder, when data is recorded on the recording track TR, the data is recorded with a parity code for error detection and correction, which is a so-called product code, and the desired data is recorded. It is designed so that recording and reproduction can be surely performed. That is, FIG.
As shown in, the data recorder has a predetermined unit (= 36,108
[BITE]) takes in the data DATA, divides the data DATA into 306 blocks, and adds a Reed-Solomon error detection and correction code (that is, C2 code) to each block. ..

After the block is further divided into first and second fields FIELD0 and FIELD1, the Reed-Solomon error detection and correction code (that is, the C1 code) is orthogonal to the C2 code for each field FIELD0 and FIELD1. Is added). As a result, in the data recorder, the bit error rate can be improved by error-correcting the reproduced data using the C1 and C2 codes during reproduction.

Further, in the data recorder, when the data DATA to which the C1 and C2 codes are added in this way is recorded on the magnetic tape 1, interleave processing is performed for each recording track TR, and even if a dropout or the like occurs due to this. The data DATA can be surely reproduced. That is, in the data recorder, the arrows a1, a2, ..., An-1, an, an + 1, a
Data D to be input in the order shown by n + 2, ... ax-1, ax
Arrows b1, b2, ..., bn-1, bn to ATA
As shown in, the order of input is changed and the data DA
TA is recorded, and thereby the data DATA is interleaved.

Further, at this time, in the data recorder, the sync signal SYNC and the sync block data ID are added for each predetermined unit (hereinafter referred to as sync block), and the preamble and the postamble data are added as a whole to make the data DATA concerned. To record. As a result, during reproduction, in the magnetic recording device, the sync signal SYNC, the sync block data ID, and the data DAT are based on the track sync data included in the preamble.
A is reproduced, and deinterleave processing can be performed based on the sync signal SYNC and the sync block data ID.

By further performing deinterleave processing, even if dropout occurs, C1 and C1
It is designed to effectively avoid the concentration of errors exceeding the error correction capability of the two codes in one place.

[0011]

By the way, in the data recorder of the ID-1 format for recording and reproducing desired data as described above, about 10 ^-10 which is practically sufficient as a data recording / reproducing device mainly for measurement. The bit error rate is guaranteed. If this bit error rate can be improved to about 10 ^-15 , it is considered that extremely important data can be stored by applying it to a magnetic tape device of a computer system used in, for example, banks.

Therefore, the usability of this type of data recorder can be improved correspondingly, and the field of application can be expanded. Further, in this type of data recorder, if high bit density recording is possible and thus the bit error rate can be improved in this way, a plurality of files are collectively recorded on one magnetic tape, and the magnetic tape It is thought that management can be facilitated.

However, when a plurality of files are collectively recorded on one magnetic tape as described above, there is a problem that searching each file becomes complicated. In this case, a method of searching the magnetic tape at a high speed is conceivable.In this case, however, the magnetic head crosses each recording track diagonally, so that the desired data cannot be reliably reproduced, and this method is applied to this type of data recorder. There are still insufficient problems.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a magnetic recording / reproducing apparatus capable of easily searching a desired file.

[0015]

In order to solve such a problem, according to the present invention, predetermined file data D0 output from the file management device 11 is transferred to helical recording tracks TR1, TR2, TR3, ... On the magnetic tape 1. In the magnetic recording devices 12 and 13 for recording on the magnetic tape 1
Of the helical recording tracks TR1, TR2, TR3 in the management information area are allocated to the management information area.
.. is recorded with management information FIT indicating the head recording position of the file data D0, and helical recording tracks TR1, TR are recorded.
2, a longitudinal recording track TC extending in the longitudinal direction of the magnetic tape 1 is formed above or below the TR3, and the longitudinal recording track TC is assigned to a search area of the file data D0 and corresponds to the management information FIT. A search pattern TREC for search is recorded in the search area.

[0016]

If the longitudinal recording track TC extending in the longitudinal direction of the magnetic tape 1 is formed, and the longitudinal recording track TC is assigned to the retrieval area of the file data D0 and the retrieval pattern TREC for retrieval is recorded, the retrieval pattern TREC is recorded. You can easily search using the criteria.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration (1-1) Configuration of Computer System In FIG. 1, reference numeral 10 generally indicates a schematic configuration of a computer system to which the present invention is applied, and write data sent from a host computer 11 together with a write request. W
R is supplied as recording data REC through the data recorder control device 12 to the data recorder 13 of ID-1 format, and the write data WR is written in the recording track on the magnetic tape.

In response to a read request input from the host computer 11, the magnetic tape of the data recorder 13 is reproduced, and the reproduced data PB obtained as a result is read out by the read data R through the data recorder controller 12.
It is input to the host computer 11 as D.

The data recorder control device 12 comprises a host interface control section 14 and a format control section 15, and the host interface control section 14
Controls the channel interface with the host computer 11, and the format control unit 15 controls the memory 1
6 is used to format the data to be transferred to and from the data recorder 13. In addition, the host interface control unit 14
The control information between the control unit 15 and the format control unit 15 is exchanged with reference to the control tower 17.

Thus, in the computer system 10, since the data recorder control device 12 is provided, the host computer 11 side has the same interface as the conventional magnetic tape device, and the data recorder 13 is connected to the external storage device of the host computer 11. It is designed to be used as

(1-2) Recording Area on Magnetic Tape Here, in the computer system 10, as shown in FIG.
As shown in FIG. 5, the magnetic tape 1 loaded in the data recorder 13 has a recording area AREC in the central portion of the tape where the degree of damage to the tape itself is relatively small in the longitudinal direction.
The bit error rate can be improved.

That is, as shown in FIG. 2A, the logical tip LBOT is located at a position, for example, 10 [m] behind the physical tip PBOT of the magnetic tape 1, and the magnetic tape 1 is physically For example, the position 15 [m] before the end PEOT is the logical end LEOT, and the logical end LB
The area from the OT to the logical end LEOT is the recording area ARE.
Used as C.

In this recording area AREC, FIG.
As shown in (B), a region between the logical leading end LBOT and a position behind by 10 [m] is used as the directory information track region DITA.

Also, this directory information track area D
After ITA, a non-recording area NRA of a predetermined length is sandwiched,
An area between the logical end LEOT and the end near NEOT at a position 15 m before, for example, is used as a user recording track area UDA, and the end near NEOT is further used.
The area between the logical end point LEOT and the logical end point LEOT is used as the volume end information area VEOVA.

(1-3) Format of recording track Here, in this computer system 10, the ID
The user data area of 36,108 [BYTE] for one recording track defined by -1 format is formatted as shown in FIG. 3, and the formatted data is interleaved in units of 4 tracks. It is designed to improve the bit error rate. Note that FIG. 3 (A) conceptually shows the type and length of information included in one track,
Further, FIG. 3B is a specific example of the C3 error correction block before the ID-1 formatting is performed.

That is, in the computer system 10,
As shown in FIG. 3A, the write data WR from the host computer 11 is composed of four tracks, for example, one block per recording track TR is 32,768 [BY].
[TE] recording data DATA is recorded.

At this time, regarding 1 recording track TR, 3
With respect to the recording data DATA that is less than 2,768 [BYTE], the first supplementary data PD1 is added to make the entire recording data 32,768 [BYTE]. In addition, 320 [BYTE] subcode data SCD is prepared to store the auxiliary information of the one recording track TR.

In addition to this, the data recorder control unit 12
3B for every 94 [BYTE] of the subcode data SCD, the recording data DATA or the first supplementary data PD1.
As shown in FIG. 5, a Reed-Solomon error detection and correction code (hereinafter referred to as C1, C2 in the ID-1 format) of 8 [BYTE] using a predetermined generator polynomial.
C3 code C3) is added according to the code), whereby error correction can be performed more strongly,
The bit error rate can be further improved.

Further, as shown in FIG.
With respect to the sub-code data SCD, the recording data DATA, the first supplementary data PD1 and the C3 code C3 which have been formatted in units of recording tracks, the data for four recording tracks TR1, TR2, TR3 and TR4 are tracked by a predetermined method. Interleaved over time,
This makes it possible to further improve the bit error rate.

As described above, the four recording tracks TR1 and T
204 [BY] is added to the beginning of the data for one recording track interleaved for R2, TR3, and TR4.
TE] second supplementary data PD2 is added, whereby the data amount for one recording track TR is ID-1 as a whole.
It is designed to be 36,108 [BYTE] specified by the format.

Since the second supplemental data PD2 is formatted at the head, the supplemental data PD2 is recorded at the plunging portion of the magnetic head where the magnetic tape 1 itself is highly damaged and the tracking is unstable in the recording track. It can be assigned, and this allows the recorded data DATA
The bit error rate can be further improved.

(1-4) Layout of recording track Here, in the case of the computer system 10, the auxiliary information of the recording track 1 stored in the subcode data SCD is the track type information indicating the type of the corresponding recording track TR. The TRID, the block number BLNO to which the recording track TR belongs, the file number FLNO to which the recording track TR belongs, the number of write retries RTCT for the recording track TR, the byte number BYCT of the data contained in the recording track, etc.

The track type information TRID includes a volume information table VIT and a file information table FI.
T, update information table UIT, dummy data track information DMY, user data track information UDT, tape mark track information TM, or recording end information EOR type information is recorded.

In practice, as shown in FIG. 5, first, the track type information TRID of the recording track TR formed in the directory information track area DITA of the magnetic tape 1.
As the volume information table VIT, the file information table FIT, the update information table UIT, or the dummy data track information DMY is used.

This directory information track area DIT
A directory information table DIT for managing files on the magnetic tape 1 as a whole is recorded in A. First, a rising area RUA of 1.5 [m] from the logical leading end LBOT of the magnetic tape 1 is recorded, and then a volume information table VI.
The recording track of T is recorded with 4 tracks of track set.

In the recording data DATA of the volume information table VIT, the head and end position information of the data block recorded in the user recording track area UDA with the entire magnetic tape 1 as one volume, the length information and recording of the file information table FIT are recorded. Sometimes the block number of the data block that executed the write retry is recorded.

Following the volume information table VIT
The file information table FIT is recorded in 256 recording tracks. Recorded data D of this file information table FIT
In the ATA, the head position information and block length of the file are recorded for each file recorded in the user recording track area UDA.

Further, following the file information table FIT, dummy data track information DMY with a predetermined number of tracks.
Is recorded, and the update information table U is recorded with the following four recording tracks.
Record IT. In the record data DATA of the update information table UIT, information indicating the presence / absence of update is recorded.

Following this update information table UIT, from the beginning of the directory information track area DITA
The dummy data track information DMY is recorded in the recording track TR up to 2.5 [m], and the remaining 2.5 [m] of the directory information track area DITA is secured as the spare area MGA.

Next, the user data track information UDT, the tape as the track type information TRID of the recording track TR formed in the user recording track area UDA sandwiching the non-recording area NRA following the directory information track area DITA of the magnetic tape 1. Mark Track Information TM
Alternatively, the recording end information EOR is used.

As the recording track TR of the user recording track area UDA, the user data track information for a plurality of blocks forming one file by sandwiching it between the recording tracks TR of the tape mark track information TM whose unit is four tracks is used. The recording track TR of the UDT is recorded, and the recording track TR of the recording end information EOR is recorded following the end of the user data track information UDT.

The recording data DATA of the tape mark track information TM and the recording end information EOR contains 32,768
The first supplementary data PD1 for [BYTE] is recorded, and the data corresponding to the write data WA input from the host computer 11 is recorded in the recording data DATA of the recording track TR of the user recording track area UDA.

Thus, the computer system 10
, A directory information track area DITA is provided at the beginning of the magnetic tape 1, and a user recording track area U
By managing the contents of the DA on a file-by-file basis, the data recorded in the data recorder 13 as viewed from the host computer 11 can be accessed in the same manner as an external recording device.

(1-5) Structure of Recording Format Unit of Format Control Unit Here, the format control unit 15 of the data recorder control unit 12 in the computer system 10 together with the memory 16 has the recording format shown in FIGS. 6 and 7. It comprises a section 20 and a reproduction format section 40.

That is, in the recording format controller 20, the host interface controller 14 stores the data of every 32 bits as the write data D0 of the 4-channel 8-bit parallel (that is, the first in first out). Consists of (FIF
O)) is input to the circuit 21 to synchronize the write data D0 with the internal clock CK, which is written as the input data D1 in the buffer memory 22 and CR.
It is sent to the C error detection circuit 23.

Although the write data D0 is processed every 4 channels in the recording format control unit 20, the description of the recording format control unit 20 will explain the data for one channel.

The CRC error detection circuit 23 receives the input data D
The error detection using CRC (cyclic redundancy code) is performed for 1 and the detection result CRCK is input to the system control circuit 24 having a computer configuration including a CPU.

When the system control circuit 24 detects an error in the input data D1 based on the detection result CRCK of the CRC error detection circuit 23, the system control circuit 24 returns this to the host interface control unit 14 as an error detection signal ER. As a result, for example, the host interface control unit 14
Executes the resend process for the write data D0 having an error.

The buffer memory 22 buffers the input data D1 by one recording track TR as described above with reference to FIG. 3, and outputs the recording data DATA obtained as a result.
Corresponding to the first buffer data D2 is sent to the first multiplexer 25.

In addition to the first buffer data D2, the first multiplexer 25 has the first supplementary data PD1 and the dummy data generation circuit 27 for the tape mark track information TM sent from the tape mark generation circuit 26, respectively. Dummy data track information DMY sent from
Dummy data for recording, the first supplementary data PD for the record data DATA sent from the supplementary data generation circuit 28.
1 is input.

As a result, the first multiplexer 25 responds to the control signal CNT input from the system control circuit 24 to record data DATA of the first buffer data D2.
To the second multiplexer 29 by adding the first supplemental data PD1 to the second buffer data D3.

In the second multiplexer 29, in addition to the second buffer data D3, the sub-code generating circuit 31 generates the contents of the directory information table DIT and the directory information table 30 sent from the directory information table memory 30. Subcode data SDC is input.

Actually directory information table memory 3
0 stores the directory information table DIT described above with reference to FIG. 5, and the subcode generation circuit 31 determines the start and end position information of the data block and the file information table F according to the contents of the directory information table DIT.
The IT length information and the block number of the data block for which the write retry is executed at the time of recording are generated.

As a result, the second multiplexer 25 converts the sub-code data S3 into the second buffer data D3 according to the control signal CNT inputted from the system control circuit 24.
The format described above with reference to FIG. 3 is formed by adding DC, and this format is sent to the C3 code generation circuit 32 as the third buffer data D4.

The C3 code generation circuit 32 generates the C3 code C3 of 8 [BYTE] and adds it to the third buffer data D4 as described above with reference to FIG. 3, and the resulting recording track data D5 is supplied to the interleave circuit 33. Send out.

The interleave circuit 33 executes the interleave processing for four tracks shown in FIG. 4 by sequentially fetching the recording track data D5 for four tracks into the interleave memory and outputting them in a predetermined order. The second recording track data D6 is sent to the third multiplexer 34.

In addition to the second recording track data D6, the third multiplexer 34 outputs the second supplementary data PD1 sent from the second supplementary data generating circuit 35 and the sync code generating circuit 36. Sync code data is input.

As a result, the third multiplexer 34 adds the second supplementary data PD2 and the synchronization code data to the second recording track data D6 according to the control signal CNT input from the system control circuit 24, and as a result, The obtained third recording track data D7 is sent to the parallel-serial conversion circuit 37.

The parallel / serial conversion circuit 37 converts the third recording track data D7 consisting of 4 channels of 8 bits parallel into 32 bits of serial recording data S0, and this is output to the data recorder 13 as recording data REC through the output circuit 38. Is entered.

In this way, in the recording format control section 20 of the format control section 15, the write data D0 input from the host interface control section 14 is input.
3 to 5, the format processing described above with reference to FIGS. 3 to 5 is executed to generate the recording data REC, and the recording data REC is recorded on the magnetic tape 1 based on the ID-1 format as shown in FIGS.

(1-6) Structure of the reproduction format section of the format control section In the reproduction format section 40 shown in FIG.
Serial reproduction data P reproduced by the data recorder 13
B is input to the serial / parallel conversion circuit 41 and is converted into the first reproduction data D10 of 8 channels parallel of 4 channels for every 32 bits, and this is input to the deinterleave circuit 42.

The deinterleave circuit 42, like the interleave circuit 33 of the recording format unit 20, sequentially takes in the first reproduction data D10 and outputs it in a predetermined order, so that the deinterleave circuit corresponding to the interleave processing of the interleave circuit 33 is performed. The processing is executed, and the second reproduction data D11 obtained as a result is input to the C3 error correction circuit 43.

The C3 error correction circuit 43 is a C3 code C added by the C3 code generation circuit 32 of the recording format unit 20.
3 is used to perform error correction processing on the second reproduction data D11, and the third reproduction data D1 obtained as a result is obtained.
2 is sent out.

Of the third reproduction data D12, the user recording data track UDT is actually used as shown in FIG.
To the buffer memory 44, and those corresponding to the directory information table DIT are input to the subcode memory 45 and the directory information table memory 46.

In the buffer memory 44, the first supplementary data PD1 included in the third reproduction data D12 is deleted,
This is input to the memory circuit 47 as the fourth reproduction data D13 and synchronized with the external clock, and this is sent to the host interface control unit 14 as the read data D14 output from the reproduction format control unit 40.

When the directory information table DIT input to the directory information table memory 46 has been updated, the system control circuit 24, together with the data recorder control signal CDIR, outputs the directory information table DI.
The update information UDD of T is sent to the data recorder 13 to update the contents of the directory information table DIT on the magnetic tape 1.

Further, the system control circuit 24 outputs the output data D
Together with the control signal CHI, a response to the data reproduction request input from the host interface control unit 14 is sent.
It is sent to the host interface control unit 14 as C.

In this manner, the reproduction format control section 20 of the format control section 15 executes the reverse format processing of the format processing described above with reference to FIGS. 3 to 5 on the reproduction data PB reproduced by the data recorder 13. , Read data D14 is generated and sent to the host interface controller 14.

(2) Search Data Here, in the data recorder control unit 12, when the recording format control unit 20 generates the recording data DATA, at the same time, the search reference signal TREC is generated, and when the recording is started, the magnetic tape is used. The data is recorded on the recording track TC extending in the longitudinal direction of 1.

That is, as shown in FIG. 8, during recording, in the system control circuit 24, the search data creation circuit 50 is used.
A control signal is output to the search data creation circuit 50, and the search data creation circuit 50 generates a reference signal TREC for search.

Here, the reference signal TREC for the search is
After recording a search pattern in which the data of values 1 and 0 are alternately repeated, the search data corresponding to the file information table FIT of the directory information track area DITA is generated. As a result, the data recorder control device 12 can detect the search pattern signal and easily detect the beginning of the file.

That is, in the system control circuit 24, when recording data in file units, a tape mark track TM is formed at the head of each file, and the head of each file can be detected with reference to the tape mark track TM. It is done like this.

Here, as shown in FIG. 9, in the tape mark track TM, a tape mark ID (in this case "0000FF0" in this case, "0000FF0" is provided as ancillary information stored in the subcode data SCD.
The data of "0" is assigned), the block number and the track number of the tape mark track TM, the number of write retries, the file number recorded after the tape mark track TM, and the like are recorded.

Correspondingly, as shown in FIG. 10, in the recording data to be recorded in the file information table FIT, data relating to each tape mark track TM is recorded in units of 2 words sequentially from the head of the magnetic tape 1. It is done like this. That is, the track set ID (FIG. 11) of the tape mark track TM is recorded in the first word, and the block number of each tape mark track TM is recorded in the succeeding word.

Therefore, the system control circuit 24 updates the file information table FIT each time each file is updated and recorded. As a result, in the computer system 10, the tape mark track TM of the track set ID corresponding to the block number of the file information table FIT based on the block number of the file information table FIT.
Can be searched for, and a desired file can be easily accessed based on the search result.

Corresponding to the track set ID and block number recorded in this file information table FIT,
The system control circuit 24 records the tape mark ID at the position designated by the track set ID (that matches the tape mark track TM), and then records the block number. As a result, the computer system 10 can retrieve a desired file on the basis of the reproduction signal of the recording track TC.

Thus, by recording the search data corresponding to the file information table FIT, even if the file information table FIT is damaged, the desired file can be easily accessed.

That is, in the system control circuit 24, when the file is accessed, the control signal CONT is output to the data recorder 13 to reproduce the data in the directory information track area DITA first. At this time, the desired track set ID is detected based on the recorded data of the file information table FIT, and the track set I
Fast forward the magnetic tape 1 to D.

At this time, in the system control circuit 24, the reproduction signal TPB of the recording track TC is fetched into the search pattern detection circuit 52, and when the search pattern is detected here, the data recorder 13 is switched to the reproduction mode. Further, the system control circuit 24 fetches the reproduction signal TPB of the following recording track TC into the decoder 54, and detects the track set ID and block number there. Here, the track set ID is the file information table F.
When the track set ID detected by IT matches, the system control circuit 24 sends the record data D14 reproduced by the reproduction format control section to the host computer 11, while when the track set ID does not match, the control signal is sent to the data recorder 13. CONT is output to detect the subsequent search pattern.

(3) Effects of the Embodiments According to the above configuration, the management data at the head of the magnetic tape is lost by recording the search data in the recording track extending in the longitudinal direction of the magnetic tape 1. But
The desired data can be easily accessed by reproducing the search data.

(4) Other Embodiments In the above-mentioned embodiment, the case where the search pattern is recorded so that the data of “1” and “0” is repeated continuously has been described, but the present invention is not limited to this. Instead, various patterns can be applied as needed.

Further, in the above-mentioned embodiment, the case where the track set ID and the block number are recorded together with the search pattern has been described, but the present invention is not limited to this, and various data may be recorded together if necessary. it can.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the D-1 format data recorder has been described. However, the present invention is not limited to this and is widely applied to a magnetic recording apparatus for recording various data. can do.

[0085]

As described above, according to the present invention, the recording track is formed in the longitudinal direction of the magnetic tape, and the search pattern is recorded in the recording track corresponding to the management data at the head of the magnetic tape. It is possible to obtain a magnetic recording / reproducing apparatus that can easily search for a desired file using a search pattern.

[Brief description of drawings]

FIG. 1 is a block diagram showing a computer system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a recording area on the magnetic tape.

FIG. 3 is a schematic diagram showing a recording format on the magnetic tape.

FIG. 4 is a schematic diagram for explaining an interleaving process between recording tracks.

FIG. 5 is a schematic diagram showing a track format on a magnetic tape.

FIG. 6 is a block diagram showing a recording format control unit.

FIG. 7 is a block diagram showing a reproduction format control section.

FIG. 8 is a block diagram showing a search circuit.

FIG. 9 is a schematic diagram for explaining a tape mark track.

FIG. 10 is a schematic diagram for explaining a file information table.

FIG. 11 is a schematic diagram for explaining a D-1 format.

FIG. 12 is a schematic diagram for explaining the interleave processing.

[Explanation of symbols]

11 ... Host computer, 12 ... Data recorder control device, 13 ... Data recorder, 15 ... Format control unit, 22 ... Buffer memory, 24 ... System control circuit, 32 ... C3 code generation circuit, 33 ... Interleaved memory, 42 ... Deinterleaved memory,
43 ... C3 error correction circuit, 52 ... Search pattern detection circuit, 54 ... Decoder.

Claims (1)

[Claims] 1. A magnetic recording apparatus for recording predetermined file data output from a file management apparatus on a helical recording track on a magnetic tape, wherein a head area of the magnetic tape is allocated to a management information area, and the management information area is provided. Management information representing the head recording position of the file data is recorded on the helical recording track, and a longitudinal recording track extending in the longitudinal direction of the magnetic tape is formed above or below the helical recording track, A magnetic recording / reproducing apparatus, wherein a recording track is assigned to a search area of the file data, and a search pattern for search is recorded in the search area corresponding to the management information.