JP2001061124A - Data recording and reproducing device and data recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make operation of a data recording and reproducing device stable by correcting data of an N-th error through the use of data of a normal disk on the occurrence of the N-th error and copying the corrected data to other area immediately, so as to reduce the probability of the occurrence of an (N+1)-th error. SOLUTION: An ECC decoder 4 of this data recording and reproducing device receives a reproduced information signal, to which an error correction code is added by an ECC encoder 5 in advance and which is recorded in a disk array device 8, as its input signal, then the ECC decoder 4 corrects an error by using the error correction code. The reproduced information signal, whose error is corrected, is fed to buffer memories 21, 22,..., 2M, 2M+1, 2M+2,..., 2M+N via a canal path 6, the ECC encoder 5, and I/F 31, 32,..., 3M, 3M+1, 3M+2,..., 3M+N.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus and a data recording / reproducing method for recording and reproducing data including input video and / or audio data on a recording medium.

[0002]

2. Description of the Related Art In order to transmit video signals in response to a plurality of occasional video signal transmission requests from a plurality of requesters, a plurality of playback devices, for example, video tape recorders, are prepared for each requester. There is a system for supplying a video signal to a monitor device of each requester.

In this system, it is necessary to prepare the same number of video tape recorders as the number of monitor devices that can be used at the same time. Therefore, if the number of monitor devices that can be used at the same time is increased, the system becomes large and expensive.

Further, in this system, it is impossible to simultaneously project video information projected by a certain monitor device on another monitor device. That is, for example, when requests from a certain requester and another requester concentrate on the same video information, simultaneous viewing is performed only when a plurality of video tapes recording this video information are prepared by the supplier side. Is possible.

[0005] Therefore, instead of preparing a video tape recorder corresponding to each requester on the video supplier side, a disk-shaped recording medium (hereinafter, referred to as a disk) storing compressed video is prepared. Systems that respond to video signal transmission requests have been considered.

[0006] The technology of a system using such a disk is disclosed in Japanese Patent Application Laid-Open No. H4-269087. Hereinafter, the main points will be described.

First, compressed video data is stored on a disk. Reading of the compressed video data from the disk is performed by time division multiplexing. The compressed video data read by time division multiplexing is subjected to decompression processing by a time axis decompression unit and supplied to each decompression unit provided on each requester side. The video information decompressed by each decompression unit is sent to each monitor device. Since the reading of the compressed video data from the disc is performed by time division multiplexing, the video data compressed on the time axis per unit time is transmitted to a plurality of requesters. In addition, the disc can read out video information of a plurality of files at random in a unit time.

Therefore, in a system using such a disk, even if the number of terminal devices that can be used simultaneously is increased, the system does not need to be large and expensive. Also,
The same video information can be viewed on a plurality of monitor devices. For this reason, the system using this disk can solve the problems of the system using the video tape recorder described above.

A system using a disk array device using a plurality of disk drives using the above-mentioned disks has also been considered. According to the system using the disk array device, the number of terminal devices and the amount of information signals that can be used simultaneously can be further increased.

[0010]

By the way, in a system using the above-described disk array device, if at least two disk drives fail, the system itself stops.

Conventionally, even if one disk drive fails, correct data can be output to the terminal device by error correction processing. However, if another disk drive fails before the failed disk drive is replaced, the system stops.

For this reason, when the system is operated unattended for 24 hours at night, after one disk drive fails at night, the system is stopped until the failure is repaired. There is a possibility that it will be.

Although the number of disk drives requires redundancy for error correction processing, the transfer rate of the entire system (hereinafter, referred to as throughput).
Is "throughput per disk drive" x
It is lower than “number” / “redundancy error correction processing”.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and suppresses the occurrence of errors in a disk drive, eliminates the need to stop operation even if at least two or more disk drives fail, and furthermore, Throughput is "throughput per disk drive" x
It is an object of the present invention to provide a data recording / reproducing apparatus and a data recording / reproducing method which are equal to “the number” / “the redundancy error correction processing”.

[0015]

In order to solve the above-mentioned problems, a data recording / reproducing apparatus according to the present invention stores a recording medium that can be randomly accessed and data containing input video and / or audio data. Recording / reproducing means for recording data on the medium and reproducing the data recorded on the recording medium; temporarily storing data input from the outside in the storage means, outputting the data to the recording / reproducing means during the assigned time slot, and A plurality of input / output processing means for temporarily storing data output from the recording means in the slot period in the storage means and outputting the stored data to the outside; Error correction coding means for outputting an error correction code of the data output from the recording medium, and a recording medium based on the error correction code and the data recorded on the recording medium. Error decoding means for decoding the data which cannot be read from the memory, and controlling the error decoding means so that the decoding processing of the error decoding means is performed in a predetermined period of the time slot period, and decoding the decoded data. It has control means for controlling the recording to be performed again on the recording medium.

The recording / reproducing means of this data recording / reproducing apparatus records data and error correction codes in different areas on a recording medium.

The recording / reproducing means records the data and the error correction code on different ones of the plurality of recording media.

The data recording / reproducing method according to the present invention, in order to solve the above-mentioned problems, provides an externally input image and / or video.
Or temporarily store data including voice data in storage means,
A first step of outputting the data from the storage means during a time slot period to which a plurality of input / output processing means are respectively assigned, and recording the data output in the first step on a randomly accessible recording medium And a second step of recording an error correction code for the data on the recording medium, reproducing the data recorded in the second step, and generating an error when the data cannot be read from the recording medium. A third step of decoding the data that cannot be read from the correction code and the reproduced data, and outputting the data reproduced in the third step to the input / output processing means during the time slot period, respectively. A fourth step of inputting the data output in the fourth step and storing the data in the storage means. A fifth step of storing and outputting the data to the outside, wherein the third step further includes a recording step of recording the decrypted data on the recording medium during a predetermined period of the time slot period. Have.

In the second step of the data recording / reproducing method, the data and the error correction code are recorded in different areas on the recording medium.

In the second step, the data and the error correction code are recorded on different ones of the plurality of recording media.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments to which the data recording / reproducing apparatus and method according to the present invention can be applied will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIG. The first embodiment is a data recording / reproducing apparatus for recording / reproducing data including video and / or audio data with a plurality of terminals.

The data recording / reproducing apparatus according to the first embodiment comprises:
As shown in FIG. 1, a disk array device 8 capable of random access and recording a large-capacity information signal is recorded on the disk array device 8 while the input data is recorded on the disk array device 8. A recording / reproducing unit for reproducing data, temporarily storing the externally input data in a plurality of buffer memories, outputting the data to the disk array device 8 during an assigned time slot, It has a plurality of input / output processing units that temporarily store the data output from the device 8 in a plurality of buffer memories and output the stored data to the outside.

The recording / reproducing unit outputs an error correcting code of the data output from the input / output processing unit (Error Correcting Code: hereinafter referred to as ECC).
The encoder 5 and the E recorded on the disk array device 8
An ECC decoder 4 for decoding the data that cannot be read from the disk array device 8 from the CC and the data,
A controller 7 for controlling the ECC decoder 4 so that the decoding process of the ECC decoder 4 is performed in a predetermined period of the time slot period, and for controlling the decoded data to be recorded in the disk array device 8 again; have.

The input / output processing unit includes a plurality of interfaces to be described later arranged before and after the plurality of buffer memories.

The disk array device 8 has M information signal disks and N error correction code disks. Originally, the disk array device 8 has a plurality of disk drive devices, but will be described below as disks for convenience of explanation.

.. M information signal disks D ₁ , D _2.
D _M and N error correction code disks D _{M + 1} , D _{M + 2.}
.. D _{M + N} has interfaces (hereinafter, referred to as I / Fs) 11 ₁ , 1 ₂ .
_{1 M, 1 M + 1,} 1 M + 2 ··· 1 M + N and a buffer memory _{2 1, 2 2 ··· 2 M} , 2 M + 1, 2 M + 2 ··· 2 M + N And I
/ F3 _1, 3 and _{2 ··· 3 M, 3 M +} 1, 3 M + 2 ··· 3 M + N are connected. For example, the information signal for the disc D ₁ is connected to the I / F1 ₁ and the buffer memory 2 ₁ and I / F3 _1, an error correction code for the disc _{D M + N I / F1 M} + N
, A buffer memory 2 _{M + N} and an I / F 3 _{M + N.}

Buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2
_{M + 1} , 2 _{M + 2} ... 2 _{M + N} are I / F1 ₁ , 1 ₂ ...
1 _M , 1 _{M + 1} , 1 _{M + 2} ... 1 _{M + N} , and stores the reproduction information signal from the disk array device 8.

The buffer memories 2 ₁ , 2 ₂ ... 2 _M ,
The signals from 2 _{M + 1} , 2 _{M + 2} ... 2 _{M + N} are I / Fs 3 ₁ , 3
ECC via ₂ ... 3 _M , 3 _{M + 1} , 3 _{M + 2} ... 3 _{M + N}
The data is supplied to the decoder 4.

The ECC decoder 4 uses the reproduced signal of the information signal recorded in the disk array device 8 to which an error correction code has been added in advance by the ECC encoder 5 as an input signal. Corrections can be made. Here, the error-corrected reproduction information signal is transmitted to a plurality of terminals R ₁ , R ₂ , R _{3.
RL -1} , _RL and canal pass 6, ECC
Encoder 5, I / F 3 ₁ , 3 ₂ ... 3 _M , 3 _{M + 1} , 3
_{M + 2} ... 3 Buffer memory 2 ₁ , 2 ₂ ... via _{M + N}
・ 2 _M , 2 _{M + 1} , 2 _{M + 2} ... 2 _{M + N} are supplied.

A plurality of terminals R ₁ , R ₂ , R ₃ ... R _L-1 , R
_{Between the L} and the ECC decoder 4 and the ECC encoder 5, the information signal flows through the transmission path in order for each terminal in units of M words corresponding to the number M of information signal disks provided in the disk array device.

ECC decoder 4 and ECC encoder 5
And buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2 _{M + 1} , 2 _{M + 2.}
... Between 2 _{M + N} , signals flow through the transmission path for each terminal in units of M + N words corresponding to the total number M + N of disks in the disk array device 8.

Buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2
_{M + 1, 2 M + 2} ··· 2 M + N and the disks D _1, D ₂ ···
Between D _M , D _{M + 1} , D _{M + 2} ... D _{M + N} , each disk simultaneously inputs and outputs information signals to and from each buffer memory.

Therefore, the ECC encoder 5 converts the information signals in M words between the plurality of terminals R ₁ , R ₂ , R ₃ ... R _L-1 and R _L into information signal disks D ₁ , D ₂ ... D _M
, Buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2 _{M + 1} , 2 _{M + 2}
Disk D ₁ signal of the M + N word units between _{··· 2 M + N, D 2} ··· D M, so as to supply to the _{D M + 1, D M +} 2 ··· D M + N Interleave.

The above-mentioned plurality of terminals R ₁ , R ₂ , R _3.
..R _L-1 , R _L , ECC encoder 5, ECC decoder 4, buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2 _{M + 1} , 2 _{M + 2}
... 2 _{M + N} , the operation of the disk array device 8 is controlled by the controller 7.

Next, the operation of the data recording and reproducing apparatus of the first embodiment, a plurality of terminals _{R 1, R 2, R 3} ··· R L-1, R
_L when the information signal is supplied from the disk array device 8 to the disk array device 8, and when a plurality of terminals R ₁ , R ₂ ,
R ₃ ... R _L−1 and R _L will be separately described.

First, a plurality of terminals R ₁ , R ₂ , R _3.
The case where an information signal is supplied to the disk array device 8 from _L-1 and _RL is as follows.

A plurality of terminals R ₁ , R ₂ , R ₃ ... R _L-1 , R
Information signals from the _L is supplied to the ECC encoder 5 sequentially in M word units corresponding to the number of the information signal for the disc D _1, D ₂ ··· D _M of the disk array device 8. This E
In the CC encoder 5, an N word is added to an error correction code. Therefore, from the ECC encoder 5, M + N
Word unit signals are output in order, and the output signal is
It is supplied in order from F3 ₁ to I / F3 _{M + N.}

Next, I / Fs 3 ₁ , 3 ₂ ... 3 _M ,
The signals supplied to 3 _{M + 1} , 3 _{M + 2} ... 3 _{M + N} are simultaneously transferred to buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2 _{M + 1} , 2 _{M + 2.}
• Written to 2 _{M + N.} Then, each of the buffer memory _{2 1, 2 2 ··· 2 M} , 2 M + 1, 2 M + 2 ··· 2 M + N
Outputs each signal to each disk, and each disk records the signal. The time required for this recording differs for each disc.

Next, the case where a reproduction information signal is supplied from the disk array device 8 to a plurality of terminals R ₁ , R ₂ , R ₃ ... R _L-1 , _RL is as follows.

The information signals read from each disk of the disk array device 8 are I / Fs _{1 1} , 1 ₂ ... 1 _M , 1
_{M + 1} , 1 _{M + 2} ... 1 _{M + N} via buffer memory 2 ₁ , 2
_{2 ··· 2 M, 2 M +} 1, 2 M + 2 is stored in the ··· 2 _{M + N.}
The time required to read this information signal differs for each disk.

The buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2
_The reproduction information signal recorded on _{M + 1} , 2 _{M + 2} ... 2 _{M + N} is
Read out all at once, I / F data 3 ₁ , 3 ₂ ... 3 _M ,
3 _{M + 1} , 3 _{M + 2} ... 3 _{M + N} are supplied. The I / F data 3 ₁ , 3 ₂ ... 3 _M , 3 _{M + 1} , 3 _{M + 2.}
3 M ₊ reproduced information signal supplied to _N from the signal of the disk D ₁ until the signal of the disc D _{M + N,} are supplied to an ECC decoder 4 sequentially. The ECC decoder 4 uses the error correction code added by the ECC encoder 5 to correct the error reproduction information signal even if there is an error in the reproduction information signal, and a plurality of terminals R ₁ , R ₂ , R _3. Supply correct word M words to _RL-1 and _RL .

Thus, a plurality of terminals R ₁ , R ₂ , R _3.
When an information signal is supplied from _RL-1 and _RL to the disk array device 8, the ECC encoder 5 adds an error correction code to the information signal, and the disk array device 8 sends a plurality of terminals R ₁ , When the reproduction information signal is supplied to R ₂ , R _3, ... _RL-1 , _RL , the ECC decoder 4 performs error correction of the reproduction information signal using the above error correction code. Even if an error occurs, a plurality of terminals R ₁ , R ₂ ,
R ₃ is ··· R _L-1, R _L can be supplied the correct reproduction information signal.

The data recording / reproducing apparatus according to the first embodiment comprises:
During the idle time during which correct reproduction information signals are being output to a plurality of terminals R ₁ , R ₂ , R ₃ ... _{RL −1} , _RL , the M information signal disks D of the disk array device 8 are used. _1, D ₂ ···
Data in a certain area of D _M is copied to another area in each disk.

The operation of copying data from one area of one disk to another area will be described below.

In this case, the disk array device 8 sends the EC
C operation of the decoder 4 to the reproduction information signal is supplied, terminal R ₁ from the disk array device 8 a plurality of the _{above, R 2, R 3 ··· R} L-1, played R _L information signals supplied This is the same as the operation when it is performed.

The reproduced information signal having been subjected to the error correction by the ECC decoder 4 is sequentially passed through the canal path 6 to the EC.
It is supplied to the C encoder 5. This ECC encoder 5
Then, N words of error correction code are added again. Therefore, the signal of the M + N word units from the ECC encoder 5 is outputted sequentially, the output signals from the I / F3 ₁ I
/ F3 Stored in order up to _{M + N.}

Next, I / Fs 3 ₁ , 3 ₂ ... 3 _M ,
The signals stored in 3 _{M + 1} , 3 _{M + 2} ... 3 _{M + N} are simultaneously stored in buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2 _{M + 1} , 2 _{M + 2.}
..2 Written to _{M + N.} Each of the buffer memories 2 ₁ , 2 ₂ ... 2 _M , 2 _{M + 1} , 2 _{M +} 2.
_{M + N} outputs each signal to each disk, and each disk records the signal in another area. The time required for this recording differs for each disc.

As described above, when an error is detected in the reproduction information signal from the disk array device 8, the data recording / reproducing apparatus of the first embodiment corrects the data in the area where the error is detected. Thus, it can be stored in another area.

As described above, in the data recording / reproducing apparatus of the first embodiment, even if N of the M + N disks of the disk array device 8 fail, the plurality of terminals R ₁ , R ₂ , R ₃ ... R _L-1 , R _L can be supplied with a correct reproduction information signal, and if 1
Even if a part of one of the disks is damaged and data cannot be read from that disk, the unreadable data is corrected by error correction processing using the data of the remaining normal disk, and this is corrected. It is possible to return to an empty area. Therefore, if there is an N-order error, the data of the N-order error can be corrected from the data of the normal disk and immediately copied to another area.
The probability of occurrence of a primary error can be further reduced, and the reliability of the system can be increased.

Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is also a data recording / reproducing apparatus for transmitting / receiving information signals to / from a plurality of terminals.

The data recording / reproducing apparatus of the second embodiment also has
As shown in FIG. 2, a disk array device 18 for recording a large-capacity information signal is provided. The disk array device 18 has M information signal disks, N error correction code disks, and one spare disk. Originally, the disk array device 18 has a plurality of disk drive devices. However, for convenience of explanation, the disk array device 18 will be described as a disk as described above. In addition,
There is no difference in the basic configuration of the data recording / reproducing unit and the input / output processing unit. The only difference is the number of connections of the input / output processing unit to the one spare disk and the connection relationship with the recording / reproduction unit.

The M information signal disks D ₁ , D ₂ ...
D _M and N error correction code disks D _{M + 1} , D _{M + 2.}
.. D _{M + N} include I / Fs 11 ₁ , 11 ₂ ... 11 _M , 11 as in the data recording / reproducing apparatus of the first embodiment described above.
_{M + 1} , 11 _{M + 2} ... 11 _{M + N} and buffer memory 12 ₁ ,
12 ₂ ... 12 _M , 12 _{M + 1} , 12 _{M + 2} ... 12
_{M + N} and I / Fs 13 ₁ , 13 ₂ ... 13 _M , 13 _{M + 1} , 1
3 _{M + 2} ... 13 _{M + N} are connected.

In the data recording / reproducing apparatus of the second embodiment,
Is reserved in the disk array device 18 as described above.
Disk D_{M + N + 1}have. This spare disk D
_{M + N + 1}Is the number of M + N disks in the disk array device 18.
If one of the disks fails, the failed disk
It is provided for exchange with a disc. This spare disk
D _{M + N + 1}Also, I / F11_{M + N + 1}, Buffer memory 12
_{M + N + 1}, I / F13_{M + N + 1}Is connected.

For example, buffer memories 12 ₁ , 12 _2.
..12 _M , 12 _{M + 1} , 12 _{M + 2} ... 12 _{M + N} , 12
_{M + N + 1} are I / Fs 11 ₁ , 11 ₂ ... 11 _M , 11 _{M + 1} ,
... 11 _{M + 2} ... 11 _{M + N} and 11 _{M + N + 1} store the reproduction information signal from the disk array device 18.

This buffer memory 12₁, 12_Two ...
12_M, 12_{M + 1}, 12_{M + 2}... 12 _{M + N}, 12_{M + N + 1}Or
These signals are sent to the I / F 13₁, 13_Two ... 13_M, 13
_{M + 1}, 13_{M + 2}... 13_{M + N}, 13_{M + N + 1}Through ECC
The data is supplied to the decoder 14.

The ECC decoder 14 uses the reproduced signal of the information signal recorded in the disk array device 18 to which an error correction code has been added in advance by the ECC encoder 15 as an input signal. Corrections can be made. Here, the error-corrected reproduction information signal is transmitted to a plurality of terminals R ₁ , R ₂ , R _3.
R _L-2 , R _L-1 , R _L , and canal path 16, ECC encoder 15, I / F 13 ₁ , 13 _2.
..13 _M , 13 _{M + 1} , 13 _{M + 2} ... 13 _{M + N} , 13
Buffer memory 12 ₁ , 12 ₂ ... 12 via _{M + N + 1
M} , 12 _{M + 1} , 12 _{M + 2} ... 12 _{M + N} , 12 _{M + N + 1} .

Actually, M + of the disk array device 18
Since the spare disk _{DM + N + 1} is added instead of the failed disk among the _N disks, the total number of disks actually used is M + N. Spare disk D _{M + N + 1}
Is the position of the processing order of the failed disk.

Therefore, a plurality of terminals R ₁ , R ₂ , R _3.
Between R _L−2 , R _L−1 , R _L and the ECC decoder 14 and the ECC encoder 15, each terminal is in turn in M word units corresponding to the number M of information signal disks provided in the disk array device 18. An information signal flows through the transmission path.

Between the ECC decoder 14 and the ECC encoder 15 and the M + N buffer memories, the signals sequentially flow through the transmission path for each terminal in M + N word units corresponding to the total number M + N of disks provided in the disk array device 18. .

Between the M + N buffer memories and the M + N12 disks, each disk simultaneously inputs / outputs information signals from / to each buffer memory.

[0062] Therefore, the ECC encoder 15
Terminal R₁, R_Two, R_Three... R_L-2, R _L-1, R_LM between
The information signals in word units are transferred to M information signal disks,
M + N word units between M + N buffer memories
Interleaving to supply signals to M + N disks
Put on.

It should be noted that the plurality of terminals R ₁ , R ₂ , R _3.
..RL _-2 , _RL-1 , _RL , ECC encoder 15, EC
C decoder 14, buffer memories 12 ₁ , 12 ₂ ...
_12M , _{12M + 1} , _{12M + 2} ... _{12M + N} , _{12M + N + 1} ,
The operation of the disk array device 18 is controlled by the controller 17.

Next, the operation of the data recording / reproducing apparatus of the second embodiment when one of the M + N disks of the disk array device 18 fails and needs to be replaced will be described. In the following description, the description proceeds with the failed disk being, for example, D _M.

Here, a plurality of terminals R ₁ , R ₂ , R ₃ ...
The operation when an information signal is supplied from R _L-2 , R _L-1 , and R _L to the disk array device 18 is the same as that of the data recording / reproducing device of the first embodiment described above, and is omitted here. I do.

[0066] First, among the M + N disks, except the failed disk D _M, was added a spare disk D _{M + N + 1} considered new is M + N disks. Spare disk
_{M + N + 1} is a sequence of failed disk D _M. The information signals read from the M + N disks to which the spare disk _{M + N + 1} has been added are I / Fs 11 ₁ , 1 ₂ ... 11 _{M + N + 1} , 1
_{M + 1} , 1 _{M + 2} ... 1 _{M + N} via buffer memory 12 ₁ ,
12 ₂ ... 12 _{M + N + 1} , 12 _{M + 1} , 12 _{M + 2} ... 12
_{Stored in M + N.} The time required to read this information signal differs for each disk. At this time, the information signal read from the spare disk D _{M + N + 1,} a plurality of terminals R ₁ by the error correction process in being erroneous but ECC decoder _{14, R 2, R 3 ···} R L- ₂ , _RL-1 and _RL output correct information signals.

The data recording / reproducing apparatus according to the second embodiment comprises:
Even if one disk fails, a plurality of terminals R ₁ , R ₂ , R ₃
... A correct reproduction information signal is output to R _L-2 , R _L-1 , and R _L , and the operation of the disk array device 18 is normally performed during the idle time of the output of the correct reproduction information signal without interrupting the operation. The data on the failed disk is corrected from the data on the defective disk and is copied to the spare disk D _{M + N + 1} .

The operation of copying data to the spare disk D _{M + N + 1} will be described below. Have recorded.

In this case, the disk array device 18
The operation until the reproduction information signal is supplied to the CC decoder 14 is performed by a plurality of terminals R ₁ , R ₂ , R ₃ ... From a disk array device 18 composed of new M + N disks.
The operation is the same as when the reproduction information signal is supplied to _RL-2 , _RL-1 and _RL .

The reproduced information signals having been error-corrected by the ECC decoder 14 are sequentially supplied to the ECC encoder 15 via the canal path 16. In the ECC encoder 15, N words are added again to the error correction code. Therefore, signals from the ECC encoder 15 are output in order of M + N words, and the output signals are I / F
From _{13 M + N + 1 I /} F13 1 , including the are stored in sequence until the I / F13 _{M + N.}

Next, I / Fs 13 ₁ , 13 ₂ ... 13
_The signals stored in _{M + N + 1} , 13 _{M + 1} , 13 _{M + 2} ... 13 _{M + N} are simultaneously stored in buffer memories 12 ₁ , 12 _2.
2 _{M + N + 1} , 12 _{M + 1} , 12 _{M + 2} ... 12 _{M + N} are written. Then, the respective buffer memories 12 ₁ , 12 ₂
... 12 _{M + N + 1} , 12 _{M + 1} , 12 _{M + 2} ... 12 _{M + N}
Each signal is output to each disk, and each disk records the signal. The time required for this recording differs for each disc. That is, the corrected information signal is written to the spare disk _{DM + N + 1} .

Therefore, the data recording / reproducing apparatus according to the second embodiment is provided with a plurality of terminals R ₁ and R ₂ when one of the disks of the disk array device 18 fails and needs to be replaced.
The correct data can be copied and recorded on the spare disk D _{M + N + 1} without obstructing the data transmission to R ₂ , R ₃ ... _RL-2 , _RL-1 and _RL . This spare disk D
_When the copying and recording of the correct data to _{M + N + 1} is completed, the data recording / reproducing apparatus returns to a normal state, and can correct the data by an error correction process even if a read error occurs again. Further, after copying and recording correct data to the spare disk _{DM + N + 1} , the failed disk is replaced with a new disk. After the replacement, the new disk becomes a spare disk.

Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, disks D1... DM... DM _{M + N} and D
_{M +} and _{N + 1,} a plurality of terminals _{R 1, R 2, R 3} , R 4 ··· R J , and a data recording and reproducing apparatus for transmitting and receiving information signals to and from the R _{J + 1} ··· R _L It is.

The data recording / reproducing apparatus of the third embodiment is
Disk D₁Information signal and a plurality of terminals R₁, R_Two, R_Three, R
_Four... R_JAnd R_{J + 1}... R_LInput and output information signals from
Buffer memory 22₁, Disk D_MInformation signal and
Number of terminals R₁, R_Two, R_Three, R_Four... R_JAnd R_{J + 1}...
R_NMemory 22 for inputting and outputting information signals from_M,
Disk D_MNInformation signal and a plurality of terminals R₁, R_Two, R_Three,
R_Four... R_JAnd R_{J + 1}... R_NInput and output information signals from
Buffer memory 22_{M + N}, Disk D_{M + N + 1}Information
Signals and multiple terminals R₁, R_Two, R_Three, R_Four... R_JAnd R
_{J + 1}... R_NBuffer memo that inputs and outputs information signals from
Re 22_{M + N + 1}Like disk D ₁... D_M... D
_{M + N}, D_{M + N + 1}And the same number of memories.

The access of the information signal between the buffer memory 22 ₁ and the disk D ₁ is performed by the memory access controller 25 ₁ via the register 21 ₁ . Access information signals between the same so that a buffer memory 22 _M and the disk D _M is also performed via the register 21 _M by the memory access controller 25 _M. That is, the disk _{D 1 ··· D M ··· D M} + N, D M + N + 1 and the buffer memory _{22 1 ·· 22 M ··· 22 M} + N, 22 M + N + 1 of each access information signals between pairs memory access controller _{25 1 ·· 25 M ··· 25 M} + N, 25 M + N + 1 by the register _{21 1 ·· 21 M ··· 21 MN} , 21
_{M + N + 1} .

Further, a plurality of terminals R₁, R_Two, R_Three, R_Four・ ・
..R_JAnd R_{J + 1}... R_LAnd each buffer memory 22₁・
・ 22_M... 22_{M + N}, 22_{M + N + 1}Between the
Registers corresponding to each memory
TA23₁..23_M... 23 _{M + N}, 23_{M + N + 1}And registers
24₁..24_M... 24_{M + N}, 24_{M + N + 1}Are input and output
It is provided as a resistor. Also, register 23₁・
・ 23_M... 23_{M + N}, 23_{M + N + 1}And terminal R₁, R_Two,
R_Three, R_Four..... R_J, R_{J + 1}... R_LBetween E
A CC decoder 27 is provided. Also, register 2
4₁..24_M... 24_{M + N}, 24_{M + N + 1}And terminal R₁,
R_Two, R_Three, R_Four..... R_J, R_{J + 1}... R_LBetween
An ECC encoder 28 is provided. Furthermore, EC
Between the C decoder 27 and the ECC encoder 28,
A null path 29 is provided.

The buffer memory 22₁..22_M... 22
_{M + N}, 22_{M + N + 1}Between the ECC decoder 27 and the ECC
Encoder 28 and buffer memory 22₁..22_M...
22 _{M + N}, 22_{M + N + 1}Access control of information signal between
Is performed by the multi-channel access controller 20.
ing. That is, the multi-channel access control
Access to the buffer memory for each terminal.
Control data for each terminal, and time-division
Is controlling the operation of Note that multi-channel access
Controller 20 and memory access controller 25
₁..25_M... 25_{M + N}, 25_{M + N + 1}Is the selector 26
₁..26_M... 26_{M + N}, 26_{M + N + 1}Switch by
Can be

Next, the data recording / reproducing device of the third embodiment
A first specific example of the arrangement will be described. Note that the data of the third embodiment is
The first specific example of the data recording / reproducing device is a data recording / reproducing apparatus for M information signals.
The information signal of the area where the error is detected
-Correct and output to multiple terminals,
The operation of copying to another area of the information signal disk will be described.
You. Therefore, the data recording / reproducing apparatus of the third embodiment
The first specific example of the disk D_{M + N + 1}, Register 2
1_{M + N + 1}, Buffer memory 22_{M + N + 1}, Register 23_{M + N
+1}, Register 24_{M + N + 1}, Memory access controller
25_{M + N + 1}, Selector 26 _{M + N + 1}Is useless.

In the first specific example of the data recording / reproducing apparatus according to the third embodiment, since one terminal inputs / outputs real-time data to / from L terminals, as shown in FIG. In this way, data for all terminals can be accessed without fail within one frame. The time obtained by equally dividing one frame into L is defined as a subframe. The state of the time division of the subframe is shown in FIG. In this subframe, the time for accessing one word of the buffer memory is called a slot. In one subframe, one slot is allocated for terminal-side access, and the remaining slot is allocated for disk-side access.

First, the data record of the third embodiment is described.
A first specific example of the recording / reproducing apparatus has a plurality of terminals R₁, R_Two,
R_Three, R_Four..... R_J, R_{J + 1}... R_LFrom disk D₁
... D _M... D_{M + N}When supplying an information signal to
Works as follows.

A plurality of terminals R ₁ , R ₂ , R ₃ , R ₄ ... R
_E , from the _J , R _{J + 1} ... _RL , in a time as shown in FIG.
An information signal enters the encoder 28. In the ECC encoder 28, N words are formed for the error correction code. Therefore, the ECC encoder 28 outputs an information signal in M + N word units at a time as shown in FIG. These information signals are stored in sequence from the register 24 ₁ of the disc D ₁ to register 24 M _{+ N} of the disk D _{M + N.}

The registers 24 ₁ ... 24 _M ... 2
Buffer memory 22 ₁ ... 22 _M from 4 _{M + N} all at once
An information signal is written to 22M _{+ N.} Each of the buffer memories 22 ₁ ... 22 _M ... 22 _{M + N} outputs each signal to each disk, and each disk records the signal.

Next, disks D ₁ ... D _M ... D _{M + N}
, A plurality of terminals R ₁ , R ₂ , R ₃ , R ₄ ... R _J , R _{J + 1}
When the reproduction information signal is supplied to _RL , the following operation is performed.

A plurality of disks D ₁ ... D _M ... D _{M + N}
Memory access controller 25 from via the selector _{26 1 ·· 26 M ··· 26 M} + N 1 ·· 25 M ··· 25
_The information signals read by _{M + N} are stored in buffer memories 22 ₁ ... 22 _M ... 22 _{M + N.}

[0085] buffer memory 22 ₁ ·· 22 _M ··· 22
_The playback information signals recorded on _{M + N} are read all at once,
Stored in registers 23 ₁ ... 23 _M ... 23 _{M + N.} This register 23 ₁ ... 23 _M ... 23
_{M +} store reproduction information signal _N from the signal of the disk D ₁ until the signal of the disc D _{M + N,} are supplied to the ECC decoder 24 in order. The ECC decoder 27 uses the error correction code added by the ECC encoder 28 to
Reproduction information even signal if there is an error in correct the error reproduced information signal, a plurality of terminals _{R 1, R 2, R 3} , R 4 ···· R J
And R _{J + 1} ... _RL are supplied with correct data in the order of M words.

Thus, a plurality of terminals R ₁ , R ₂ , R ₃ ,
R ₄ ···· R _J and R _J + 1 ··· from R _L disk D ₁ ·
..D _M ... When an information signal is supplied to D _{M + N} ,
ECC encoder 28 adds an error correction code to the information signal, the disk _{D 1 ··· D M ··· D M} + plurality of terminals R ₁ from _{N, R 2, R 3,} R 4 ···· R J And R _{J + 1} ... R _L
Is supplied to the ECC decoder 27, the error correction code is used by the ECC decoder 27 to correct the error of the reproduction information signal. Therefore, even if an error occurs during reproduction, a plurality of terminals R ₁ , R ₂ ,. R ₃ , R ₄ ... R _J and R _{J + 1.
L} can be supplied with a correct reproduction information signal.

A first specific example of the data recording / reproducing apparatus according to the third embodiment includes a plurality of terminals R ₁ , R ₂ , R ₃ , R _4.
During the idle time during which the correct reproduction information signal is output to _J and R _{J + 1} ... _RL , M information signal disks D ₁ ,
The data in the area of the D ₂ ··· D _M, are copied to another area in each disk.

The operation of copying data from one area of one disk to another area will be described below.

In this case, disks D ₁ ... D _{M.
The operation from the M + N} to the supply of the reproduction information signal to the ECC decoder 27 is performed by the plurality of terminals R ₁ , R ₂ , R ₃ ,
R ₄ ··· R _J and R _{J + 1} ··· R _N in the reproduction information signal is the same as the operation when supplied.

The reproduced information signals having been error-corrected by the ECC decoder 27 are sequentially supplied to an ECC encoder 28 via a canal path 29. In the ECC encoder 28, N words of the error correction code are added again. Therefore, signals in M + N word units are sequentially output from the ECC encoder 28, and the output signals are sequentially stored up to the registers 24 ₁ ... 24 _M ... 24 _{M + N.}

Next, registers 24 ₁ ... 24 _M ... 24
_The signals stored in _{M + N} are simultaneously stored in the buffer memory 22 ₁
..22 _M ... written to 22 _{M + N.} Each of the buffer memories 22 ₁ ... 22 _M ... 22
_{M + N} converts each signal into a register 21 ₁ ... 21 _M.
Output to each disk via 21 _{M + N} , and each disk records the signal in another area.

[0092] Thus, the first specific example of the data recording and reproducing apparatus of the third embodiment, the disk D ₁ ··· D _M ·
If an error is detected in the reproduction information signal from D _{M + N,} the data in the area where the error has been detected can be corrected and stored in another area.

As described above, according to the first specific example of the data recording / reproducing apparatus of the third embodiment, even if N disks out of M + N disks fail, the plurality of terminals R ₁ , _{R 2, R 3, R 4} ··· R J and R _J + 1 ··· R _N
Supply the correct playback information signal to the
Even if a part of one disk is damaged and the data cannot be read from the disk, the unreadable data is corrected by an error correction process using the data of the remaining normal disk, and this is corrected. It is possible to return to the free space of the disk. Therefore, if there is an Nth-order error, the data of the Nth-order error can be corrected from the normal disk data and immediately copied to another area, so that the probability of occurrence of the (N + 1) th-order error can be further reduced.
The reliability of the system can be increased.

Next, a second specific example of the data recording / reproducing apparatus of the third embodiment will be described. Note that the second embodiment of the data recording and reproducing apparatus of the third embodiment, even if a disk fails one, a plurality of terminals _{R 1, R 2, R 3} , R 4 ··· R J and R _J and outputs the correct reproduction information signal to the ₊₁ ··· R _N,
Without interrupting the operation, and correct the correct reproduction information signal data disk failure from the disk _{D 1 ··· D M ··· D M} + N normal disk data in the free time of the output of Copied to spare disk _{DM + N + 1} .

Therefore, the configuration of the second specific example of the data recording / reproducing apparatus of the third embodiment is as shown in FIG. The spare disk D _{M + N + 1} is provided for replacement of a failed disk when _one of the M + N disks fails.

That is, the spare disk D _{M + N + 1} is
Of the N disks, the total number of disks actually used is M + since it is added instead of the failed disk.
There are N sheets. The spare disk D _{M + N + 1} is located in the processing order of the failed disk.

Therefore, a plurality of terminals R ₁ , R ₂ , R ₃ , R _4.
.., R _J , R _{J + 1,} ... _RL and the ECC decoder 27 and the ECC encoder 28 transmit information signals in order of each terminal in units of M words corresponding to the number M of information signal disks. Flowing on the road.

Between the ECC decoder 27 and the ECC encoder 28 and the M + N buffer memories, signals sequentially flow through the transmission path for each terminal in units of M + N words corresponding to the total number of disks M + N.

Between the M + N buffer memories and the M + N disks, each disk simultaneously inputs and outputs information signals to and from each buffer memory.

[0100] Therefore, the ECC encoder 28
Terminal R₁, R_Two, R_Three, R_Four..... R _J, R_{J + 1}... R_L
The information signal in M word units between
The disk has M + N channels between M + N buffer memories.
To supply M + N discs of signals per card
Interleave.

Next, the operation of the second specific example of the data recording / reproducing apparatus of the third embodiment when one of the M + N disks fails and needs to be replaced will be described. In the following description, the description proceeds with the failed disk being, for example, D _M.

Here, a plurality of terminals R ₁ , R ₂ , R ₃ , R _4.
, R _J , R _{J + 1, RL} The operation when information signals are supplied to a plurality of disks is the same as that of the above-described first specific example, and will not be described here.

First, among the _{M + N} disks, except for the failed disk D _M , a spare disk D _{M + N + 1} is added, and it is assumed that there are M + N new disks. Spare disk
_{M + N + 1} is a sequence of failed disk D _M. The information signals read from the M + N disks to which the spare disk _{M + N + 1} has been added are the registers 21 ₁ ... 21 _{M + N + 1.}
Buffer memory 22 via the _{M + N 1 ·· 22 M +} N + 1 ···
22 _{M + N.} At this time, the spare disk D _{M + N + 1}
The information signal read from the plurality of terminals R ₁ ,
The _{R 2, R 3, R 4} ···· R J and R _J + 1 ··· R _L, the correct information signal is outputted.

As described above, in the second specific example of the data recording / reproducing apparatus according to the third embodiment, even if one disk fails, a plurality of terminals R ₁ , R ₂ , R ₃ , R _4. ..R _J and R
_{J + 1} ... Outputs the correct playback information signal to _RL and corrects the data of the failed disk from the data of the normal disk during the idle time of the output of the correct playback information signal without interrupting the operation. Is copied to the spare disk _{DM + N + 1} .

The operation of copying data to the spare disk D _{M + N + 1} will be described below. Have recorded.

In this case, the operation until the reproduction information signal is supplied from a plurality of disks to the ECC decoder 27 is performed by a plurality of terminals R ₁ , R ₂ ,
R _3, R ₄ ···· R _J and R _J + 1 ··· R _L in the reproduction information signal is the same as the operation when supplied.

[0107] The reproduction information signals, which have been error-corrected by the ECC decoder 27, are sequentially supplied to the ECC encoder 28 via the canal path 29. In the ECC encoder 28, N words of the error correction code are added again. Therefore, signals in M + N word units are sequentially output from the ECC encoder 28, and the output signals are output from the register 24 ₁ including the register 24 _{M + N + 1} to the register 24 ₁
Stored in order by _{M + N.}

Next, the registers 24 ₁ ... 24 _{M + N + 1.}
The signals stored in _{24M + N} are simultaneously written into buffer memories 22 ₁ ... _{22M + N + 1} ... _{22M + N.} Each of the buffer memories 22 ₁ ... 22 _{M + N + 1.}
..22 _{M + N} outputs each signal to each disk, and each disk records the signal. That is, the corrected information signal is written to the spare disk _{DM + N + 1} .

Therefore, in the second specific example of the data recording / reproducing apparatus according to the third embodiment, when one disk has failed and needs to be replaced, a plurality of terminals R ₁ , R ₂ , R ₃ , R _{3 Four}
... without interfering with the data transmission to R _J and R _{J + 1,} ... R _N, can be copied and recorded the correct data to the spare disk D _{M + N + 1.} When the copying and recording of the correct data to the spare disk D _{M + N + 1} is completed, the data recording / reproducing apparatus returns to a normal state, and can correct the data by an error correction process even if a read error occurs again. Further, after copying and recording correct data to the spare disk _{DM + N + 1} , the failed disk is replaced with a new disk. After the replacement, the new disk becomes a spare disk.

As a specific example of the error correction processing means of the data recording / reproducing apparatuses of the first and second embodiments and the data recording / reproducing apparatus of the third embodiment, a parity code can be used.

A method using the parity code will be described below. If there is an error in one disk including an error correction code disk using even parity or odd parity, if it is known which disk has an error,
Data can be corrected and output. For this reason, one error correction code disk is required for M information signal disks.

First, FIG. 7 shows an ECC encoder using a parity code. 7, the input signal input to the register 31 is a signal in which data is configured in units of M words for each terminal as shown in FIG. Register 31
Latches this input signal according to clock CK,
The latch data is supplied to the selector 35 and also to the exclusive OR gate 32. The exclusive OR gate 32 stores the latch data of the previous stage and the register 31
XOR with the latch data of. When the exclusive OR processing is performed M times, a parity code can be generated. The output from the exclusive OR gate 32 is supplied to the selector 35 via the register 33. Selector 3
5 changes the selection according to the count output of the counter 34 that counts the number of disks. That is, when the number of disks is equal to or less than M, the latch output of the register 31 is selected, and when the number of disks is M, the latch output of the register 33 is selected, and the data of M + 1 words is set as the encoded output via the register. This encoded output has a time structure as shown in FIG.

Next, an ECC decoder using a parity code is shown in FIG. 8, the input signal input to the register 41 is a signal in which data is configured in M + 1 word units for each terminal as shown in FIG. Register 4
1 latches this input signal in accordance with the clock CK and supplies the latched data to the shift register 42 and to the AND gates 45 and 46. To the AND gates 45 and 46, the latch data latched by the register 53 in accordance with the number of error disks and the latch data output from the register 49 are also supplied. The latch data from the register 53 and the latch data from the register 49 are supplied to the AND gate 47. The output logic of these AND gates 45, 46 and 47 is supplied to an OR gate 48. Here, AND gate 4
5, 46, and 47 and the OR gate 48 form an exclusive OR gate that holds the previous value for the time of the disk in error and suspends the product sum once. The exclusive OR gate takes the exclusive OR of the immediately preceding latch data and the latch data of the register 41, and performs this operation M + 1 times except for the time of the error disk. If the process is performed M + 1 times, the data on the error disk can be restored. The counter 51
The number M of disks is counted, and the count value is supplied to the register 52. The register 52 supplies the number of latch data to the clock terminal of the register 50. The selector 43
For the time of the error disk, the latch data from the register 50 is selected.
2 is selected. Thereby, the selector 4
3 outputs decoded data in units of M words via a register 44. This decoded output signal is shown in FIG.
The time configuration is as shown in FIG.

The disk itself performs error correction by itself. The problem is that when one of the disks fails, the system goes down. Therefore, instead of monitoring the data itself, the failure of the disk is monitored by the above-described parity code so that error data is not output to the outside. Such a method using a parity code is suitable for the data recording / reproducing apparatus and the data recording / reproducing apparatus of the present invention since it has the minimum redundancy and a simple circuit configuration.

As a specific example of the error correction processing means of the data recording / reproducing apparatus of the first and second embodiments and the data recording / reproducing apparatus of the third embodiment, a Reed-Solomon code can be used. .

A method using the Reed-Solomon code will be described below. N error correction disks are required for M information signal disks.

For example, in the case of the primary correction and the secondary erasure correction, when there is an error in the data of one disk including the error correction code disk, the ECC circuit itself can determine which disk is the error and correct it. . In this case, the number of disks M + 2 is input in advance from the outside. If an error occurs, the error disk number is output. Also, if there is an external notification of which disk has an error, the data error of the N × 2 disks can be corrected.

The disk itself performs error correction by itself. The problem is that when one of the disks fails, the system goes down. Therefore, instead of monitoring the data itself, the failure of the disk is monitored using the above-described Reed-Solomon code so that error data is not output to the outside. The method using such a Reed-Solomon code has higher redundancy and a more complicated circuit than the method using a parity code.
Since the ECC itself can detect the error, the error data can be corrected without externally notifying the error disk.

[0119]

According to the data recording / reproducing apparatus of the present invention, the error correction encoding means outputs an error correction code of the data output from the input / output processing means, and the error decoding means outputs the error correction code recorded on the recording medium. The unreadable data is decoded from the correction code and the data, and the control unit controls the error decoding unit to perform the decoding process in a predetermined period of the time slot period, and records the decoded data again. Since the data is recorded on the medium, if there is an Nth-order error, the data of the Nth-order error can be corrected from the data of the normal disk, and can be immediately copied to another area. Can be stabilized.

In the data recording / reproducing method according to the present invention, data including video and / or audio data input from the outside is temporarily stored in a storage means, and the data is output from the storage means during a predetermined time slot period. When the output data is recorded on a randomly accessible recording medium and the error correction code for the data is recorded on the recording medium, and the recorded data is reproduced and the data cannot be read from the recording medium. Decoding the data that cannot be read from the error correction code and the reproduced data, outputs the reproduced data in the time slot period, temporarily stores the output data in storage means, Output, and further, the decoded data is stored in a predetermined period of the time slot period. Since the recorded serial recording medium, if there is an N-order errors, the data of a normal disk, N
The data of the next error can be corrected and immediately copied to another area, the probability of occurrence of the (N + 1) th error can be reduced, and the operation can be stabilized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a data recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of a data recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a data recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 4 is a diagram illustrating the division of frames and subframes for explaining the operation of the data recording / reproducing apparatus of the third embodiment shown in FIG. 3;

FIG. 5 is a diagram illustrating the division of frames and subframes for explaining the operation of the data recording / reproducing apparatus according to the third embodiment shown in FIG. 3;

FIG. 6 is a diagram illustrating the division of a frame and subframes for explaining the operation of the data recording / reproducing apparatus of the third embodiment shown in FIG. 3;

FIG. 7 is a circuit diagram of an error correction encoder using a parity code.

FIG. 8 is a circuit diagram of an error correction processing decoder using a parity code.

[Explanation of symbols]

1, 3 interface, 2 buffer memory, 4
Error correction processing decoder, 5 error correction processing encoder, 6 canal path, 7 controller, 8 disk array device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/12 G11B 20/18 552Z 20/18 552 570Z 570 572F 572 574B 574 574D

Claims (6)

[Claims] 1. A recording medium capable of random access, recording / reproducing means for recording data including input video and / or audio data on the recording medium and reproducing the data recorded on the recording medium, The data input from the outside is temporarily stored in the storage means, and is output to the recording / reproducing means during the assigned time slot period, and the data output from the recording / reproducing means during the time slot period, A plurality of input / output processing means for temporarily storing the data in the storage means and outputting the stored data to the outside; and the recording / reproducing means includes an error correction code for the data output from the input / output processing means. From the recording medium from the error correction code and the data recorded on the recording medium. Error decoding means for decoding the unreadable data; and controlling the error decoding means so that the decoding processing of the error decoding means is performed in a predetermined period of the time slot period. A data recording / reproducing apparatus, further comprising control means for controlling the data to be recorded on the recording medium again. 2. The data recording / reproducing apparatus according to claim 1, wherein the recording / reproducing means records the data and the error correction code in different areas on the recording medium. 3. The data recording / reproducing apparatus according to claim 1, wherein the recording / reproducing means records the data and the error correction code on different ones of the plurality of recording media. 4. A method for temporarily storing data including video and / or audio data input from outside in a storage means, and outputting the data from the storage means during a time slot period to which a plurality of input / output processing means are respectively assigned. A first step of recording the data output in the first step on a randomly accessible recording medium and recording an error correction code for the data on the recording medium.
And reproducing the data recorded in the second step, and decoding the data that cannot be read from the error correction code and the reproduced data when the data cannot be read from the recording medium. A fourth step of outputting the data reproduced in the third step to each of the input / output processing means during the time slot period, and a fourth step of outputting the data reproduced in the fourth step. A fifth step in which data is input, temporarily stored in storage means, and output to the outside, wherein the third step further comprises the step of storing the decoded data in a predetermined period of the time slot period. A data recording / reproducing method, comprising a recording step of recording on the recording medium. 5. The data recording / reproducing method according to claim 4, wherein in the second step, the data and the error correction code are recorded in different areas on the recording medium. 6. The method according to claim 4, wherein in the second step, the data and the error correction code are recorded on different ones of the plurality of recording media.
Data recording / reproducing method as described.