JPH03259462A - Recording method for rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the number of times of searching in recording and reproduction by recording a data to a consecutive data area again against a defect error on the way of recording, thereby recording succeeding data while being shifted backward and recording the data again to the consecutive data area even when an error takes place when no recording is formed up to a replace area. CONSTITUTION:Data by 5 blocks (logic block numbers A0, A1, A2, A3, A4) are recorded on the recording area (physical block numbers a0, a1, a2, a3, a4) of a magnetic tape. When a defect error takes place in the physical block a2, the data A2 is recorded again in the succeeding physical block a3, the data A3 is recorded in the physical block a4, the idle area (r0) of a replace area is searched and the data A4 is recorded therein and a logic physical address cross reference list is corrected to terminate the recording. Thus, only one search operation for a long distance is needed for searching the idle area of the replace area, thereby shortening the recording time. Furthermore, in the case of reproduction, only one search for a long distance is needed and the access time is shortened, as well.

Description

[Detailed description of the invention] (a) Industrial use! f The present invention relates to a data recording method for a data recorder for recording and reproducing data in a computer or the like using a 4-3 head type magnetic recording/reproducing device.

(b) Digital data for 5 conventional technology blocks (logical program number A
. , A1, A1, A3, A,) as the physical block number a.

+Receives a command to record in each area al, a2, a3, a from the host computer side, records data A0 in the physical block aO with the preceding recording hand, monitors the area with the monitor head, Determine whether recording was performed normally. If recording was performed normally, data A is recorded in the next physical block a. If recording was performed normally, data A is recorded in the next physical block a.・Record data A in block a2, and if recording is not performed normally, that is, in a defect state, search for an empty area in the replacement area where re-recording will be performed in the event of a defect state, and write the physical block r. . Data A is re-recorded in physical block a, the logical/physical address correspondence table is changed, and data A is recorded in physical block a.

If the recording is performed normally, data A4 is recorded in the physical block a, and if the recording is performed normally, the process ends (see FIG. 8).

In the recording state as shown in Fig. 8, digital data for five blocks (logical block numbers AO1A1, A2, A1, A,
), first reproduce data 80,A, recorded in physical block a6,al, and then reproduce data 80,A, recorded in physical block a,
When it is determined that the data recorded in is defective, a replacement area re is searched according to the logical/physical address correspondence table of FIG. 9, and the replacement area r is found. Regenerate data A recorded in physical block a,
Search for and reproduce data A, then physical block a
The data A4 recorded in 4 is reproduced.

(c) Problems to be Solved by the Invention However, according to the recording method described above, if a defect error occurs at one location, the search operation is required twice, and the recording time becomes longer. , the disadvantage is that the access time is long during playback.

(d) Means for Solving the Problems The present invention is intended to solve the above problems, and in response to a defect error during recording, re-recording is performed in a continuous data area, so that subsequent data The present invention provides a method in which the blocks are shifted backward and recorded in the replacement area by the number of blocks in which an error has occurred.

It also provides a method of checking whether there is any recording up to the replacement area and re-recording in a continuous data area even if an error occurs if there is no recording up to the replacement area.

(e) Effect According to the above means, the number of searches during recording and reproduction can be reduced in a rotary head type magnetic recording and reproducing apparatus.

(f) Embodiment Figures 1 to 3 show the system groove bottom of the present invention, and in the figure (1) is an R-DAT for audio.
The same mechanism at the bottom of the groove as in the mechanism (1) is provided with a rotating cylinder, a capstan motor, a reel motor, etc. (2) is a recording/reproducing amplifier that sends and receives recording/reproducing signals between a recording/reproducing rotary head (A head) and a reproducing rotary head (B-rad) arranged 180 degrees apart on a rotating cylinder; 3) is a frame in which the first and second check codes are added (C, , C,), interleaving, etc. are applied to each frame at the time of recording, and error detection and correction using the check code, de-interleaving, etc. are performed during playback. The signal processing circuit (4) is an intra-group signal processing circuit that adds a tertiary check code during recording and performs error detection and correction using the check code during playback for each group. 4) is constructed as shown in FIG. That is, (5) is an error correction circuit that adds a check code during recording in units of one group and performs error detection and correction using the check code during playback, and (6) is an error correction circuit that interleaves data during recording in units of one group. (7) and (8) temporarily store data sent from the host computer in groups during recording, and generate data reproduced from the tape during playback. The 1st and 2nd group memories are temporarily stored in units, and the 2nd group memory (8
) The data stored in the group memory (7) is supplied to the intraframe signal processing circuit (3) via the interface circuit (9) with an error correction code added from the error correction circuit (5). This will be carried out while the data is being read, and data will be stored/read in both group memories (7) and (8). (10) is a control circuit that controls the first and second glue 7 memories (7) and (8), the error correction circuit (5), and the interleaving address generation circuit (6) under control from the system control circuit described later. , 1st and 2nd group memo at the time of recording) (7) (8) A check code is added in each group to the data read out from the 1st and 2nd group memory (7) (8) at the time of playback. The interleaving address generation circuit (6) performs de-interleaving on the data that has been previously stored and subjected to error detection and correction by the error correction circuit (5) in group units. (11)
(12) is a reel servo circuit that drives and controls the reel motor. (13) is a capstan servo circuit that drives and controls the capstan motor. (14) is a cylinder servo circuit that drives and controls the rotating cylinder. (14) The ATF circuit extracts signals in the ATF region from the output of the recording/playback amplifier (2) through the signal processing circuit (3) and generates a tracking error signal.This error signal is supplied to the capstan servo circuit (13) and output from the capstan servo circuit (13). Used to control the rotation speed of stun motors. (15) is a subcode processing circuit that extracts signals in the subcode area from the output of the recording/playback amplifier (2) using the intra-frame signal processing circuit (3) during playback; The in-group signal processing circuit (4), the in-frame signal processing circuit (3), and the cylinder servo circuit (11) are controlled by the output from the code processing circuit (15) or the command circuit (described later).
, the reel servo circuit (12), and the capstan servo circuit (13). and,
(17) is an input/output device that serves as an input/output terminal to the host computer, and (18) is a command circuit that gives commands to the system control circuit (16) in response to commands from the host computer through this input/output device (17). The command circuit (18) is constructed as shown in FIG. That is,
(19) is a data buffer memory that temporarily stores data sent from the host computer during recording (save) and temporarily stores data played back from the tape during playback (loading), and (20) is a data buffer memory that temporarily stores data sent from the host computer during recording (save). (21) an instruction decoding circuit that outputs the command to a control circuit to be described later;
receives the output from the instruction decoding circuit (20) and sends it to the data buffer memory (19) and the logical/physical correspondence table memory (
23) is a control circuit that controls the system control circuit (16), and connects the data back memory (19) and the first and second group memo J (7) via the interface circuit (22).
) (8) Controls the transfer of data between.

As before, data for five blocks (logical block numbers A0, A3, A, , A, , A4) are stored in the recording area of the magnetic tape (physical block numbers a0, al, a, , a Is
a4), and a defect error occurs in physical block a as shown in Figure 4, data A2 is recorded again in the next physical block a, and data A is recorded in physical block a. After that, a vacant area (r.) in the replace area is searched and data A is recorded, and the logical/physical address correspondence table is corrected accordingly as shown in FIG. 5, and the recording operation is completed. Therefore, a long-distance search operation searches an empty area in the replacement area1.
This reduces the recording time. Furthermore, during playback, a long distance search operation is performed only once, and access time is also shortened.

Next, a second embodiment will be described. Similarly to the above embodiment, data for five blocks (logical block number A3, A1, A
7, A1, A,) in the second recording area (physical block numbers a0, A4, A2, A8, A4.) of the magnetic tape, and a defect error occurs in physical block a2 as shown in Figure 6. Re-record data A in the next physical block a, record data A3 in physical block a4, check the recording status from physical blocks a to a, and check whether recording is being performed in the recording table. If there is no record, data A is stored in physical block a.
4 and change the logical/physical address correspondence table as shown in FIG. Therefore, there is no need to perform a search operation even once, making it possible to shorten recording time and access time.

(G) Effects of the Invention According to the recording/reproducing method of the present invention, the number of search operations can be reduced, so recording time and access time can be shortened, and a rotary hand type magnetic recording/reproducing device can be used. It is extremely useful for use in digital data recorders.

[Brief explanation of drawings]

1 to 7 relate to the present invention, FIGS. 1, 2, and 3 are diagrams showing the system configuration, and FIGS. 4 and 5 are diagrams showing the system configuration.
The figures are for explaining the first embodiment, and FIG. 4 shows the recording state of the tape, FIG. 5 shows the logical/physical address correspondence table, and FIGS. 6 and 7 show the second embodiment. 6 is a diagram showing the recording state of the tape, FIG. 7 is a logical/physical address correspondence table, and FIGS. 8 and 9 are related to the conventional recording method. FIG. 8 is a diagram showing the tape recording state, and FIG. 9 is a logical/physical address correspondence table thereof. (18)...Command circuit, (19)...Data output memory, (21)...Control circuit, (23)...Logic...Physical correspondence table memory.

Claims (1)

[Claims] (1) A rotary head for recording and playback that records digital data on each track on the tape is located at a predetermined angle away from the rotary head for playback, and has a step for retracing the same track that the head has traced. has a rotating head,
A data read-after-write check is performed using the rotary head dedicated to playback, and if a data error occurs,
In a rotating head type magnetic recording/reproducing device that performs replacement in a replacement area provided at a predetermined position in the data area on a tape, a logical/physical block exchange table showing the relationship between logical blocks and physical blocks is used. It has a storage means and a storage means for a recording table indicating whether or not recording has been performed for each physical block, and when a defect error occurs in an intermediate block during recording of a plurality of blocks, the recording table is stored. Checks whether there is any recording from the block where the error occurred to the next replacement area according to the table, and if there is no record, the data after the block where the error occurred is shifted backward in block order and recorded, and at the same time the logical/physical block conversion is performed. The table is changed, and if there is a record, the data after the block where the error occurred is shifted backward one block and recorded, and the data overflowing from the area where it should have been recorded is recorded in the replacement area, and at the same time the logic A recording method for a rotary head type magnetic recording/reproducing device characterized by changing a physical block conversion table.