JPH07307063A - Data recording method - Google Patents

Abstract

PURPOSE:To shorten a time required for recording and reproducing a system log for each partition by recording tape history information for each partition in a system region of the first partition. CONSTITUTION:This device is provided with a tracking control section 50 in which data inputted through an interface controller 10 is converted to a formatted signal by a recording system signal processing section 20, the signal is recorded in tilt tracks TA, TB on a magnetic tape 32, reproduced by a recording and reproducing section 30, and a tape running system of the reproducing section 30 is controlled. And the recording and reproducing section 30 is provided with a rotary drum 31 which is provided so that a pair of rotary magnetic heads 31A, 31B make an angle of 180 degrees, and makes the drum 31 run with the prescribed running speed in a state in which a magnetic tape is wound around the drum 31 in a range of approximately 90 degrees. And two tilt tracks TA, TB on the magnetic tape 32 are scanned by a pair of rotary magnetic heads 31A, 31B every rotation of the rotary drum 31, and a signal is recorded and reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method and a data recording apparatus for recording data sent from a computer or the like on an inclined track on a magnetic tape by a rotary head.

[0002]

2. Description of the Related Art In a computer, in order to protect data written in a hard disk, for example,
These data are transferred and recorded once a day to a data recorder called a data streamer.

Conventionally, a normal analog audio tape recorder has been widely used as the data recorder. However, in this analog audio tape recorder, the consumption of the magnetic tape is extremely large and the data rate at the time of recording is low, so that it takes time to record and transfer the data. Further, the analog audio tape recorder has a drawback in that it does not perform high-speed search operation, and therefore it takes time to search for a desired data start portion, that is, so-called cueing.

Therefore, a helical scan type digital audio tape recorder using a rotary head, a so-called DA is used.
It is practiced to use T as a data recorder.

When DAT is used as a data recorder, the data from the host computer is converted into DAT format data before recording. DA
In the T format, as shown in FIG. 11, two inclined tracks T _A and T _B formed while two heads having different azimuths make one rotation make up one frame,
16 bits of PCM audio data are interleaved and recorded in units of this one frame. One track consists of 196 blocks, each block of which is 36 bytes. Of these, 34 blocks at both ends are sub-areas, and 128 blocks in the center are main areas.

The sub-area includes a margin section, a sub-code PLL preamble section, and a first section from one end of the track.
Subcode section, Postamble section, Gap section between adjacent blocks, Track King (ATF: Automatic Track
Finding) signal section, adjacent block gap section, data PLL preamble section, adjacent block gap section, ATF signal section, adjacent block gap section, subcode PLL preamble section, second subcode section, postamble section, It is divided into a gap section between adjacent blocks and a margin section. The first sub-code section and the second sub-code section are composed of 8 blocks, and the other sections are composed of a predetermined number of blocks.

The main area is composed of 128 data blocks. As shown in FIG. 12, in one data block, a sync signal, a PCM ID, a block address, and a parity are arranged in 1 byte each from the beginning of the block, and main data is arranged in the next 32 byte section.

When handling an audio signal, the main data is 16-bit PCM data for each of the L channel and the R channel. As shown in FIG. 13, this 16-bit main data is interleaved in the main area of one frame, that is, two tracks, and is arranged together with the parity Q. In this case, approximately 5760 bytes of data will be recorded in the main area of one frame.

As described above, in the DAT format, by dividing one track into a main area and a sub area, after-recording can be performed using the sub area.

Here, the structure of the error correction code of the main data in the DAT format is a two-dimensional code as shown in FIG. 14, and the code plane is composed of four planes for one track, and the planes are in the C1 and C2 directions, respectively. It is encoded.

When the DAT is used as a data recorder, the data sent from the host computer is treated as 16-bit data and treated in the same manner as the PCM data. Record in the area. In that case, 2 bytes 16 bits of data corresponding to the L and R channels are used,
For example, the upper 4 bits are recorded as the format ID, and the lower 8 bits are recorded as the logical frame number. The format ID indicates a format unique to the data recorder, and logical frame numbers, for example, 23 frames are set as one unit, and frame numbers 1 to 23 are added to each unit.

As a data recorder format using such DAT, for example, ECMA (EU
DDS and DDS2 are defined by the RPPEAN COMPUTER MANUFACTURERS ASSOCIATION standard.

In the DDS format or the DDS2 format, as shown in, a physical tape start position (PBOT: PBOT: PBOT :) is provided in the head area following the leader tape as an area for loading and unloading the magnetic tape.
A device area from the Physical Beginning of Tape to a logical tape start position (LBOT: Logical Beginning of Tape) is defined, and a reference area and a system area are provided next to the device area. The reference area is used as a physical reference when recording a system log (history information) in the system area. Then, a data area for recording data is provided next to the system area, and E is provided next to this data area.
An OD (EOD: End of Data) area is provided.

Further, in the above DDS2 format,
Two partitions P1 each consisting of a reference area, a system area, a data area and an EOD area
A two-partition tape having P2 is defined, and a system log (history information) for each partition P1, P2 is recorded in the system area of the partition P1, P2. The system log was recorded in the form of a pack in the subcode area of the system area.

[0015]

By the way, the above-mentioned DDS
In the format and the DDS2 format, since the system log for each partition is individually recorded in each system area of the two partitions, it is necessary to access each system area when loading / unloading the tape. However, there is a problem that loading / unloading takes time.

Since the system area is recorded and reproduced many times, the tape damage is large. Therefore, multiple recording is required. Further, since the sub-code area is not subjected to the error correction code C2, its reliability is lower than that of the main data area.

In order to increase the reliability, the firmware takes time to access the data recorded in multiple recording, but in reality, it can only check up to the time limit of the frame. Also, the types of items that can be written in the form of a pack were limited.

Therefore, the present invention has been made in view of the above-mentioned conventional circumstances, and has the following objects.

That is, an object of the present invention is a data recording method for recording data on a tilted track on a magnetic tape by a rotary head in a tape format having a plurality of partitions each consisting of at least a system area and a data area, An object of the present invention is to provide a data recording method that shortens the time required to record and reproduce the system log for each partition.

Another object of the present invention is a data recording method for recording data on inclined tracks on a magnetic tape by a rotary head in a plurality of tape formats each having a plurality of partitions each including at least a system area and a data area. Thus, it is to provide a data recording method for storing a system log corresponding to each tape format.

Another object of the present invention is to provide a data recording method which improves the reliability of the system log.

[0022]

DISCLOSURE OF THE INVENTION The present invention is a tape format having a plurality of partitions and is a data recording method for recording data on a slanted track on a magnetic tape by a rotary head, and tape history information for each partition. Is recorded in the system area of the first partition.

The present invention is also a data recording method for recording data on a slanted track on a magnetic tape by a rotary head in a tape format having a plurality of partitions each including at least a system area and a data area. The tape history information for each is recorded in the system area of the first partition.

In the data recording method according to the present invention, one track is divided into a main data area and margin areas at both ends of the main data area, the main data area of each track is divided into a plurality of blocks, and one block is divided into a plurality of blocks. It is divided into a plurality of sections, a sync signal is recorded in the first section of each block, a subcode is recorded in the second section, main data is recorded in the third section, and tape history information for each partition is recorded at the beginning. The sub-code is recorded in the system area of the partition.

The data recording method according to the present invention is
The track is divided into a main data area and margin areas at both ends of the main data area, the main data area of each track is divided into a plurality of blocks, one block is divided into a plurality of sections, and a first section of each block is divided. A sync signal is recorded in the second section, a subcode is recorded in the second section, main data is recorded in the third section, and tape history information for each partition is recorded as the main data in the system area of the first partition. Characterize.

The present invention is a data recording method for recording data on a slanted track on a magnetic tape by a rotary head in a plurality of tape formats having a plurality of partitions, and discriminating the tape format of the magnetic tape,
For the magnetic tape of the first tape format, the tape history information for each partition is recorded in the system area of each partition, and for the magnetic tape of the second tape format, the tape history information for each partition is recorded first. It is characterized by recording in the system area of the partition.

The present invention is also a data recording method for recording data on a tilted track on a magnetic tape by a rotary head in a plurality of tape formats each having a plurality of partitions each including at least a system area and a data area. Discriminate the tape format of the magnetic tape, for the magnetic tape of the first tape format,
The tape history information for each partition is recorded in the system area of each partition, and for the magnetic tape of the second tape format, the tape history information for each partition is recorded in the system area of the first partition. To do.

The data recording method according to the present invention has the above-mentioned second aspect.
For the magnetic tape of the tape format of No. 1, one track is divided into a main data area and margin areas at both ends of the main data area, the main data area of each track is divided into a plurality of blocks, and one block is divided into a plurality of sections. And the sync signal is recorded in the first section of each block
A sub-code is recorded in the section, main data is recorded in the third section, and tape history information for each partition is recorded as the sub-code in the system area of the partition.

The data recording method according to the present invention is based on the above second method.
For the magnetic tape of the tape format of No. 1, one track is divided into a main data area and margin areas at both ends of the main data area, the main data area of each track is divided into a plurality of blocks, and one block is divided into a plurality of sections. And the sync signal is recorded in the first section of each block
A sub code is recorded in the section, main data is recorded in the third section, and tape history information for each partition is recorded as the main data in the system area of the partition.

[0030]

In the data recording method according to the present invention, in recording the data on the inclined track on the magnetic tape by the rotary head in the tape format having a plurality of partitions, the tape history information of each partition is stored in the head partition. Record in the system area. In the data recording method according to the present invention, tape history information for each partition is recorded as a subcode in the system area of the first partition. Further, in the data recording method according to the present invention, tape history information for each partition is recorded in the system area of the first partition as main data.

Further, in the data recording method according to the present invention,
The tape format of the magnetic tape is discriminated, the tape history information of each partition is recorded in the system area of each partition for the magnetic tape of the first tape format, and the tape history information of each partition is recorded for the magnetic tape of the second tape format. The tape history information for each partition is recorded in the system area of the first partition. In the data recording method according to the present invention, tape history information for each partition is recorded as a subcode in the system area of the partition.

Furthermore, in the data recording method according to the present invention, tape history information for each partition is recorded as main data in the system area of the partition.

[0033]

Embodiments of the data recording method according to the present invention will be described below in detail with reference to the drawings.

The data recording method according to the present invention is carried out by a data streamer having a structure as shown in FIG. 1, for example.

This data streamer records / reproduces data on / from an inclined track on a magnetic tape by a rotary magnetic head, and includes an interface controller 10 for exchanging data with the outside and the interface controller 10. A recording-system signal processing unit 20 that performs signal processing on the data input via the signal and converts it into a signal of a predetermined format, and a signal supplied from the recording-system signal processing unit 20 by a pair of rotary magnetic heads 31A and 31B. Recording on a slanted track on the magnetic tape 32,
A recording / reproducing unit 30 for reproducing the signal recorded on the inclined track by the rotary magnetic heads 31A and 31B.
And a reproduction system signal processing section 40 for reproducing the original data by performing signal processing on the reproduction signal reproduced by the recording / reproducing section 30, and a tracking control section 50 for controlling the tape running system of the recording / reproducing section 30. And so on.

In this data streamer, the recording / reproducing section 30 comprises a rotary drum 31 in which a pair of rotary magnetic heads 31A and 31B are arranged at an angle of 180 °, and a magnetic tape 32 is provided around the rotary drum 31. About 9
The magnetic tape 32 is run at a predetermined running speed while being wound in the range of 0 °. And
For each rotation of the rotary drum 31, as shown in FIG.
The pair of rotary magnetic heads 31A and 31B scans the two inclined tracks T _A and T _B on the magnetic tape 32 to record and reproduce signals.

In this data streamer, one track is divided into three areas of a main data area and margin areas at both ends of the main data area, and the main data area is divided into 64 blocks with 195 bytes as one block. Further, a 1-byte first section for recording a synchronization signal, a 6-byte second section for recording a subcode and a block address, a 2-byte third section for recording a header parity, and data 186. One block is divided into four in the fourth section of the byte, and the subcode and the block address are recorded together with the data in each block of the main data area.

The 186-byte data recorded in the fourth section is the error correction code C having a two-dimensional structure as shown in FIG.
2, C1 are added. The error correction code C1 is added to the main data for each block and recorded, and the error correction code C2 is divided into two and recorded at both ends of the main data area of each track.

In addition, in this data streamer, one frame of 2 tracks, that is, 128 blocks, is 4 frames.
6 tracks or 23 frames in 1 unit (group)
The error correction code configuration is adopted, and as shown in FIG. 4, the error correction code C2 of the data string corresponding to the track direction is arranged and recorded on both sides of the track, and the data string corresponding to the track width direction is recorded. The error correction code C3 of
Allocate to the last 2 tracks of 6 tracks and record.
It should be noted that index information for distinguishing a series of data is added to each unit.

As the subcode, a separator count, which is delimiter information indicating a delimiter of main data, a record count indicating the number of records, an area ID indicating each area defined on the tape format, and an absolute position of a recording unit. The frame number shown, the group count showing the number of recording units, the checksum, etc. are recorded.

Here, in this data streamer, as in the DDS2 format, as a tape format, as shown in FIG. 5, a magnetic tape loading and unloading area is provided in the head area following the leader tape. Physical tape start position (PBOT: Ph
A device area from the ysical Beginning of Tape) to the logical tape start position (LBOT: Logical Beginning of Tape) is defined, and a reference area and a system area are provided next to the device area. The reference area is used as a physical reference when recording a system log (history information) in the system area. Then, a data area for recording data is provided next to the system area, and E is provided next to this data area.
An OD (EOD: End of Data) area is provided. Furthermore, as shown in FIG. 6, a two-part partition having two partitions P1 and P2 each consisting of a reference area, a system area, a data area and an EOD area.
The tape is specified.

The system log (history information) of each partition P1 and P2 is recorded in the system area of the partition P1. In this way, the system log (history information) of each partition P1 and P2
Both are recorded in the system area of the partition P1 so that only the system area of the partition P1 needs to be reproduced / recorded at the time of loading / unloading the tape. Therefore, recording / reproduction of the system log for each partition is performed. The time required for can be shortened.

In this data streamer, the interface controller 10 sends and receives data to and from an external host computer (not shown) via the bus 11, and transfers the data sent from the host computer to the recording system signal processing section. The data reproduced by the reproduction system signal processing section 40 is supplied to the host computer 20.

Further, the recording system signal processing section 20 receives the index information by the index adding circuit 21 and the sub code generating section 22 to which the data inputted through the interface controller 10 is supplied, and the index adding circuit 21 outputs the index information. The error correction code generation unit 23 to which the added main data is supplied, the main data to which the error correction code is added by the error correction code generation unit 23, and the subcode and block address are supplied from the subcode generation unit 22. A subcode adding circuit 24, a header parity adding circuit 25 to which main data having a subcode and a block address added by the subcode adding circuit 24 is supplied, and a header parity is added by the header parity adding circuit 25. Main data is supplied 8/1 The modulation circuit 26, the synchronization signal addition circuit 27 to which the main data converted into 10-bit data by the 8/10 modulation circuit 27 is supplied, and the margin to which the main data to which the synchronization signal addition circuit 27 is added are supplied. It comprises an adding circuit 28 and a recording amplifier 29 to which the main data added with the margin by the margin adding circuit 28 is supplied.

The index adding circuit 21 adds index information to the data input via the interface controller 10 to divide one series of data in units of 46 tracks, that is, 23 frames. Add.

The error correction code generating section 23 includes a memory 49, a C3 encoder 23A and a C2 encoder 23.
It consists of B and C1 encoder 23C.

In the error correction code generating section 23, the memory 49 temporarily stores the main data to which the index information is added by the index adding circuit 21 for each unit. Then, the C3 encoder 23A
Generates the error correction code C3 of the data string corresponding to the above-mentioned track width direction for the main data for each unit stored in the memory 49, and this error correction code C
3 is assigned to the last 2 tracks of the 46 tracks per unit. Further, the C2 encoder 23B generates an error correction code C2 of the data string corresponding to the track direction, divides the error correction code C2 into two, and allocates the error correction code C2 to both ends of the main data area of each track. Further, the C1 encoder 23C generates the error correction code C1 for each block described above.

In the sub-code adding circuit 24, the error-correcting code generating section 23 causes the error-correcting codes C3 and C to be generated.
The subcode and block address supplied from the subcode generator 22 are added to the main data to which 2, C1 is added. As a result, the subcode and block address are assigned to the second section of each block.

Here, the sub-code generating section 22 comprises first and second sub-code generating circuits 22A and 22B and a system log generating circuit 22C.

In the sub-code generating section 22, the first sub-code generating circuit 22A, based on the data input via the interface controller 10, the separator count, which is the delimiter information indicating the delimiter of the main data, and the like. A record count indicating the number of records is generated. In addition, the second sub-code generation circuit 22B
Automatically generates an area ID indicating each area defined on the tape format, a frame number, a group count indicating the number of recording units, a checksum, etc. together with the block ares. Further, the system log generation circuit 22
C creates a system log (history information) for each of the partitions P1 and P2 defined as the tape format.

Further, the header parity adding circuit 25
Generates 2-byte parity for error detection for the subcode and block address added to the main data by the subcode adding circuit 24, and adds the 2-byte parity to the main data. As a result, the 2-byte parity is assigned to the third section of each block.

The 8/10 modulation circuit 26 converts the main data, to which the header parity and block address are added by the header parity adding circuit 25, from 8 bits to 10 bits in 1-byte units and records the signal. So that the DC level of is maintained at about 0.

Further, the synchronizing signal adding circuit 27 adds a synchronizing signal for each block to the main data converted into 10-bid data by the 8/10 modulating circuit 26. As a result, the synchronization signal is assigned to the first section of each block.

Further, the margin adding circuit 28 adds to the main data to which the synchronizing signal adding circuit 27 is added,
Add a margin for each track. As a result, margin areas are added to both sides of each main data area for each track described above.

Then, the main data to which a margin is added for each track by the margin adding circuit 28 is
It is supplied to the recording / reproducing unit 30 via the recording amplifier 29.

In this data streamer, the recording system signal processing section 20 having such a configuration is provided, so that
The track is divided into three areas, a main data area and margin areas at both ends of the main data area, and 195 bytes are divided into one area.
The main data area is divided into 64 blocks as blocks, and further, a 1-byte first section for recording a sync signal, a 6-byte second section for recording a subcode and a block address, and a header parity are recorded. One block can be divided into four into a third section of bytes and a fourth section of 186 bytes for recording data, and a subcode can be recorded together with data in each block of the main data area. Then, as the subcode, a separator count, which is delimiter information indicating a delimiter of main data, a record count indicating the number of records, an area ID indicating each area defined on the tape format, a frame number, and a group indicating the number of recording units. You can record counts and checksums. In this way, one track is divided into three areas of the main data area and margin areas at both ends of the main data area, and the subcode is recorded together with the main data in the main data area. it can. Moreover, the reliability of the subcode can be improved by recording the 2-byte parity for detecting the error of the subcode in the third section of each block. Therefore, it is possible to provide a data recording medium with high track usage efficiency.

In this data streamer, error correction codes C2 and C1 having a two-dimensional structure are generated for the 186-byte data recorded in the fourth section, and the error correction code C1 is used as main data for each block. The error correction code C2 can be added and recorded, and the error correction code C2 can be divided into two and recorded at both ends of the main data area of each track. In this way, by recording the error correction code C1 for each block, it is possible to improve the reliability of the main data for each block. By recording the error correction code C2 for each track, the reliability of the main data for each track can be improved. Moreover, the error correction code C2 is divided into two and recorded at both end portions of the main data area for each track, so that the sliding contact with the rotary head is started / started.
You can separate the main data area from the end,
It is possible to reduce errors that occur in the data in the main data area.

In addition, in this data streamer, one frame of 2 tracks, that is, 128 blocks, is 4 frames.
6 tracks or 23 frames in 1 unit (group)
The error correction code configuration is adopted, the error correction code C2 of the data string corresponding to the track direction is arranged and recorded on both sides of the track, and the error correction code C3 of the data string corresponding to the track width direction is described above. It can be recorded by being allocated to the final two tracks of the 46 tracks. Further, index information for discriminating a series of data can be added and recorded for each unit. In this way, by arranging and recording the error correction code C2 of the data string corresponding to the track direction on both sides of the track, it is possible to make the main data less likely to be destroyed and to reduce the probability of occurrence of an error in the main data. Lowering the error correction code C of the data string corresponding to the track width direction
3 makes it possible to surely correct the error in the main data.

Further, in this data streamer, the system log (history information) for each partition P1, P2
Are recorded as subcodes in the system area of the partition P1. Thus, in the system area of the partition P1, each partition P1,
By recording both system logs (history information) for each P2, the access time can be shortened and a data streamer with good operability can be realized.

In the data streamer, the reproduction system signal processing section 40 supplies the reproduction signal reproduced from the inclined track of the magnetic tape 32 by the recording / reproducing section 30 through the reproduction amplifier 41. The detection circuit 42, the 10/8 demodulation circuit 43 to which the binarized reproduction data is supplied from the synchronization signal detection circuit 42, and the reproduction data converted from the 10/8 demodulation circuit 43 to 8-bit data are included in the header. A subcode separation circuit 45 supplied through the parity check circuit 44, an error correction processing unit 46 in which subcodes are separated by the subcode separation circuit 45 and reproduction data is supplied, and an error is generated in the error correction processing unit 46. It comprises an index separation circuit 47 and the like to which the corrected reproduction data is supplied.

In the reproducing system signal processing section 40, the synchronizing signal detecting circuit 42 detects a synchronizing signal from the reproducing signal supplied from the recording / reproducing section 30 via the reproducing amplifier 41, and outputs the synchronizing signal. The reproduced signal is binarized by the synchronized clock to generate reproduced data.

Further, the 10/8 demodulation circuit 43 converts 10-bit data into 8-bit data for the reproduction data supplied from the synchronization signal detection circuit 42. 8/10 modulation circuit 2
10/8 demodulation corresponding to 6 is performed.

The header parity check circuit 4 is also provided.
In 4, the parity check of the subcode and the block address is performed using the above 2-byte header parity.
Then, the sub-code separation circuit 45 separates the correct sub-code, which has been parity-checked by the header parity check circuit 44, from the reproduced data and supplies it to a system controller (not shown).

Further, the error correction processing section 46 includes a memory 49, a C1 decoder 46A, a C2 decoder 46B and a C2 decoder 46B.
3 decoder 46C.

In the error correction code generator 46, the memory 49 temporarily stores the main data to which the index information is added in units of the main data of the 46 tracks, that is, 23 frames. It should be noted that this memory 49 is equivalent to the recording system signal processing section 2
It is shared with the error correction code generation processing unit 23 of 0.

With respect to the main data for each unit stored in the memory 49, the C1 decoder 46A
Is an error correction code C added to each block described above.
1 is used to perform error correction processing on the main data of each block. The C2 decoder 46B adds the error correction code C2 added to both ends of the main data area of each track, for the main data for each unit that has been subjected to error correction processing by the C1 decoder 46A.
Is used to perform error correction processing on the data string corresponding to the track direction. Further, the C3 decoder 46C has been subjected to error correction processing by the C2 decoder 46B.
With respect to the main data for each unit, error correction processing is performed on the data string corresponding to the track width direction using the error correction code C3 assigned to the last two tracks of the above-mentioned one unit of 46 tracks.

Further, the index separation circuit 47 separates the index information from the main data for each unit which has been subjected to the error correction processing by the error correction processing section 46 and supplies it to a system controller (not shown) or the like.

This data streamer is provided with the reproducing system signal processing section 40 having such a configuration, so that in the error correction processing section 46, the error correction code C1 for each block, the error correction code C2 for each track, and one unit. By performing the error correction process using the error correction code C3 for each, the error of the main data can be surely corrected, and the extremely reliable main data can be obtained.

Further, in this data streamer, the tracking control section 50 includes the reproduction system signal processing section 4
Block address detection circuit 51 to which a block address is supplied from 0 through the header parity check circuit 44, PG detection circuit 52 to which a PG pulse is supplied from the recording / reproducing unit 30, the block address detection circuit 51 and the above A time detection circuit 53 to which each detection output of the PG detection circuit 52 is supplied, a tracking servo circuit 54 to which the detection output of this time detection circuit 53 is supplied, and a capstan drive to which the output of this tracking servo circuit 54 is supplied. The circuit 55 and the like.

In the tracking control unit 50, the block address detection circuit 51 detects a correct block address that is parity-checked by the header parity check circuit 44, and outputs a detection output indicating the detection timing to the time detection circuit 53. Supply. Also,
The PG detection circuit 52 detects a PG pulse indicating the rotation phase of the rotary drum 31 supplied from the recording / reproducing unit 30, and supplies a detection output indicating the detection timing to the time detection circuit 53. The time detection circuit 53 is
The block address detection circuit 51 detects a predetermined block address and detects the time between one timing and the timing when the PG detection circuit 52 detects the PG pulse. Here, when an inclined track on the magnetic tape 32 is scanned by the rotary magnetic heads 31A and 31B having a predetermined rotation phase, as shown in FIG. 7, the scanning distance from the tape edge of the track to a predetermined block is just tracking. In the state of 1, the value is L, but when there is a tracking error, it changes by ± Δ depending on the tracking error. Therefore, the time detected by the time detection circuit 53 changes from the time in the just tracking state according to the tracking error.

Then, the tracking servo circuit 54
Detects a time difference between the reference time and the time detected by the time detection circuit 53, that is, a tracking error, and sets the tracking error to 0 based on the detection output. As described above, the capstan drive circuit 55 for driving the capstan motor of the tape running system of the recording / reproducing unit 30 is controlled.

Since the data streamer is provided with the tracking control unit 50 having such a configuration, the tracking control can be performed without recording the ATF signal for tracking control on the magnetic tape. Therefore, since it is not necessary to secure a section for recording the ATF signal for tracking control, the data amount of the main data can be increased correspondingly, and the utilization efficiency of the track can be further improved.

In this data streamer, the system log for each partition P1 and P2 generated by the system log generation circuit 22C is converted to the subcode adding circuit 24, and the system log of the partition P1 is used as a subcode. I recorded the system log,
The system log for each partition P1, P2 generated by the system log generation circuit 22C may be supplied to the C2 encoder 23B to record each system log as main data in the system area of the partition P1.

When the system log of each partition P1 and P2 is recorded as main data in the system area of the partition P1 as described above, the error correction code C2 is also applied to the system log, so that the reliability of the system log is improved. You can

The data streamer may handle magnetic tapes of a plurality of tape formats. In this case, for example, as shown in FIG. 8, the tape cartridge 34 mounted in the recording / reproducing unit 30 is provided with an identification hole 35 of the data format, and the identification hole 3 is provided.
The detection output from the identification hole detection unit 61 that detects 5 is supplied to the system controller 62, the format of the magnetic tape 32 is determined by the system controller 62, and control corresponding to each format is performed according to the flowchart shown in FIG. 9, for example. To do so.

That is, the system controller 62 described above.
Is a tape cartridge 34 containing the magnetic tape 32.
Is attached to the recording / reproducing unit 30, in step S1, the identification hole 35 of the tape format provided in the tape cartridge 34 is detected by the identification hole detection unit 61, and in the next step S2, The format of the magnetic tape 32 is determined based on the detected output.

Then, in step S2, the first
When it is determined that the tape format is No. 2, the process proceeds to step S11, and when it is determined that the second tape format is performed, the process proceeds to step S21.

The first tape format is the conventional DDS2 format, and the second tape format is the format adopted in the above embodiment.

In step S11, the magnetic tape 32 is run to the system area of the first partition P1. In step S12, the system log information of the first partition P1 is read and stored in the memory. In the next step S13, the magnetic tape 32 is put into the second
Drive to the system area of the partition P2, and in step S14, the system log information of the second partition P2 is read and stored in the memory.

In the next step S15, various control operations such as data writing / reading are performed according to an instruction from a system controller (not shown), and the system log on the memory is updated according to the operation contents.

When the eject command is received, the process proceeds to step 16 and the magnetic tape 32 is set to the second
The system log information of the second partition P2 is recorded in the system area of the second partition P2 in step S17. In the next step 18, the magnetic tape 32 is run to the system area of the first partition P1, and in step S19, the system log information of the first partition P1 is recorded in the system area of the first partition P1. Then step S
In step 30, the tape cartridge 34 is ejected from the recording / reproducing unit 30, and the control of the magnetic tape 32 of the first tape format is completed.

That is, with respect to the magnetic tape 32 of the first tape format, each partition P is subjected to the series of control operations in steps S11 to S19.
The system log for each P1 and P2 is individually recorded in the system area of each partition.

In step S21, the magnetic tape 32 is moved to the system area of the first partition P1. In step S22, the system log information of the first partition P1 is read and stored in the memory.

In the next step S23, various control operations such as data writing / reading are performed according to an instruction from a system controller (not shown), and the system log on the memory is updated according to the operation contents.

When the eject command is received, the process proceeds to step 24, and the magnetic tape 32 is set to the first
Of the first partition P1 and the system log information of the second partition P2 are both stored in the first partition P1 in step S19.
It records in the system area of 1. Then, in step S30, the tape cartridge 34 is ejected from the recording / reproducing unit 30, and the control of the magnetic tape 32 of the second tape format is completed.

That is, with respect to the magnetic tape 32 of the second tape format, the system log of each partition P1 and P2 is set to the first partition by the series of control operations of the above steps S21 to S25. It will be recorded in the system area.

Here, for the magnetic tape 32 of the second tape format, the partitions P1 and P
The system log for each 2 may be recorded as a subcode in the system area of the first partition, but if each system log is recorded as main data, the system log is protected by the error correction code C2. The reliability of can be improved.

In each of the above-mentioned embodiments, each partition P1 and P2 has a DDS which comprises a reference area, a system area, a data area and an EOD area.
Although the tape format similar to the 2 format is adopted, in the data recording method according to the present invention, both system logs (history information) of each partition P1 and P2 are set in the system area of the first partition P1 as described above. Since the data is recorded, as shown in FIG. 10, it is possible to adopt a tape format in which the system area of the subsequent partition P2 is omitted and the system area is provided only in the first partition P1.

[0089]

According to the data recording method of the present invention, when recording data on a slanted track on a magnetic tape by a rotary head in a tape format having a plurality of partitions, the tape history information of each partition is used as the first partition. Since it is recorded in the system area of
It is possible to reduce the time required to record and reproduce the system log for each partition.

Further, in the data recording method according to the present invention,
The tape format of the magnetic tape is discriminated, the tape history information of each partition is recorded in the system area of each partition for the magnetic tape of the first tape format, and the tape history information of each partition is recorded for the magnetic tape of the second tape format. Since the tape history information for each partition is recorded in the system area of the first partition, the system log corresponding to each tape format can be recorded.

Further, in the data recording method according to the present invention, the tape history information for each partition is recorded as the main data in the system area of the first partition, so that the reliability of the system log can be improved.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration of a data streamer for carrying out a data recording method according to the present invention.

FIG. 2 is a diagram showing a track format of a magnetic tape on which data is recorded by the data streamer.

FIG. 3 is a diagram showing a data structure of one track of data recorded on a magnetic tape by the data streamer.

FIG. 4 is a diagram showing a data structure of one unit of 46 tracks of data recorded on a magnetic tape by the data streamer.

FIG. 5 is a diagram showing a tape format of a magnetic tape on which data is recorded by the data streamer.

FIG. 6 is a diagram showing a tape format of a two-partition tape of the magnetic tape.

FIG. 7 is a diagram illustrating a principle of detecting a tracking error by a tracking control unit in the data streamer.

FIG. 8 is a block circuit diagram showing a configuration of a main part for format discrimination in the case of handling magnetic tapes of a plurality of tape formats in the data streamer.

FIG. 9 is a flowchart showing a control operation of a system controller corresponding to two types of tape formats.

FIG. 10 is a diagram showing another tape format of the two-partition tape of the magnetic tape.

FIG. 11 is a diagram showing a DAT format.

FIG. 12 is a diagram showing a block format of main data in the DAT format.

FIG. 13 is a diagram showing a data array by interleaving in the DAT format.

FIG. 14 is a diagram showing the structure of an error correction code of main data in the DAT format.

[Explanation of symbols]

 10 interface controller 20 recording system signal processing unit 21 index addition circuit 22 subcode generation unit 22A first subcode generation circuit 22B second subcode generation circuit 22C system log generation circuit 23 error correction code generation unit 23A C3 encoder 23B C2 Encoder 23C C1 Encoder 24 Subcode addition circuit 25 Header parity addition circuit 26 8/10 Modulation circuit 27 Synchronous signal addition circuit 28 Margin addition circuit 30 Recording / reproducing unit 31 Rotating drum 31A, 31B Rotating magnetic head 32 Magnetic tape 40 Magnetic tape 40 Reproducing system signal processing Circuit 42 Synchronization detection circuit 43 8/10 demodulation circuit 44 Header parity check circuit 45 Subcode separation circuit 46 Error correction processing unit 46A C1 decoder 46B C2 decoder 46C C3 decoder 4 7 Index separation circuit 49 memory

Claims (8)

[Claims] 1. A data recording method for recording data on a tilted track on a magnetic tape by a rotary head in a tape format having a plurality of partitions, wherein tape history information for each partition is stored in a system area of the first partition. A data recording method characterized by recording. 2. A data recording method for recording data on a slanted track on a magnetic tape by a rotary head in a tape format having a plurality of partitions each comprising at least a system area and a data area, wherein a tape history for each partition A data recording method characterized by recording information in the system area of the first partition. 3. One track is divided into a main data area and margin areas at both ends of the main data area, the main data area of each track is divided into a plurality of blocks, and one block is divided into a plurality of sections. The sync signal is recorded in the first section of each block, the subcode is recorded in the second section, the main data is recorded in the third section, and the tape history information of each partition is recorded in the system area of the first partition. The data recording method according to claim 1 or 2, wherein the data is recorded as a code. 4. One track is divided into a main data area and margin areas at both ends of the main data area, the main data area of each track is divided into a plurality of blocks, and one block is divided into a plurality of sections. The sync signal is recorded in the first section of each block, the subcode is recorded in the second section, the main data is recorded in the third section, and the tape history information of each partition is recorded in the system area of the first partition. The data recording method according to claim 1 or 2, wherein the data is recorded as data. 5. A data recording method for recording data on a slanted track on a magnetic tape by a rotary head in a plurality of tape formats having a plurality of partitions, the tape format of the magnetic tape being discriminated, and the first tape For the formatted magnetic tape, the tape history information for each partition is recorded in the system area of each partition. For the magnetic tape of the second tape format, the tape history information for each partition is recorded in the system area of the first partition. A data recording method characterized in that the data is recorded in. 6. A data recording method for recording data on a tilted track on a magnetic tape by a rotary head in a plurality of tape formats each having a plurality of partitions each comprising at least a system area and a data area, the tape being a magnetic tape. The format is determined, the tape history information of each partition is recorded in the system area of each partition for the magnetic tape of the first tape format, and the tape of each partition is recorded for the magnetic tape of the second tape format. A data recording method characterized by recording history information in the system area of the first partition. 7. For the magnetic tape of the second tape format, one track is divided into a main data area and margin areas at both ends of the main data area, and the main data area of each track is divided into a plurality of blocks. Then, one block is divided into a plurality of sections, the synchronization signal is recorded in the first section of each block, the subcode is recorded in the second section, the main data is recorded in the third section, and the tape for each partition is recorded. 7. The data recording method according to claim 5, wherein the history information is recorded in the system area of the partition as the subcode. 8. For the magnetic tape of the second tape format, one track is divided into a main data area and margin areas at both ends of the main data area, and the main data area of each track is divided into a plurality of blocks. Then, one block is divided into a plurality of sections, the synchronization signal is recorded in the first section of each block, the subcode is recorded in the second section, the main data is recorded in the third section, and the tape for each partition is recorded. 7. The data recording method according to claim 5, wherein the history information is recorded in the system area of the partition as the main data.