JPS63298875A - Alternate buffer recorder - Google Patents

Abstract

PURPOSE:To increase the recording capacity by splitting a temporary storage means into two in forward/backward direction and providing a data compression means in-between so as to detect a recording error, excluding it and realizing highly reliable recording storage. CONSTITUTION:The titled recorder is provided with a data compression processing unit 7 receiving alternately a data plural buffer memories 5, 6 to thin out and compress the data, plural compression buffers 8, 9, recording tentatively a data from the compression processing unit 7 alternately and writing it in an optical disk 4 and reading the data from the optical disk in checking the written data, a comparison collation device 10 comparing and collating the data and a controller controlling the entire processing. That is, two pairs of plural storage means 5, 6, 8, 9 are used to apply data transfer of the alternate buffer system to attain high speed processing, the data compression processing unit 7 applies data compression to attain large storage and the data recorded on the optical disk is read as required into the compression data buffers 8, 9 to check the error and alarm display is given if there is any error.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to alternate buffer recording 1i2t for recording from a magnetic recording means onto an optical disk at high speed by alternately using a plurality of buffer memories.

(Prior Art) Since the optical disk storage device e1 (hereinafter referred to as an optical disk) can store a large amount of data stably and without deterioration, it is possible to store data stored in a magnetic disk storage device (hereinafter referred to as a magnetic disk). Recording on optical discs is being carried out.

In this case, data is compressed using a restorable method in order to increase the number of data stored on the optical disc, and then transferred and recorded on the optical disc.

Conventionally, in order to increase the speed of data transfer and recording from a magnetic disk to an optical disk, an alternate buffer recording method as shown in FIG. 4 has been used as an effective means. In the figure, 1 is a magnetic disk that stores data, and 2 and 3 are temporary memory buffers that temporarily store data alternately in order to transfer data from the magnetic disk 1 to the optical disk 4. A and a temporary memory buffer B. Transfer from magnetic disk 1 to temporary storage buffer 7 (A>2 is 1, temporary storage buffer 7 (8) 3 is transferred, - time storage buffer (A) 2 is transferred to optical disk 4 is C9 temporary storage. The transfer from the buffer (B) 3 to the optical disk 4 is assumed to be d.

The transfer method is to transfer a certain number of good blocks of data from the magnetic disk 1 to the temporary storage buffer (A) 2, and to start transferring it to the temporary storage buffer (B) 3 at the same time as the transfer a ends. During the transfer, data is transferred and recorded from the temporary storage buffer (A) 2 to the optical disk 4. After the process of transfer C is completed, the data is transferred from the temporary storage buffer (B) 3 to the optical disk 4.
At the same time as the transfer recording d starts, the transfer a from the magnetic disk 1 to the temporary storage buffer (A) 2 starts. In this way, temporary memory buffer 7 (A) 2 and temporary memory buffer (B
) 3 are used alternately to shorten the transfer time.

(Problems to be Solved by the Invention) In the above method, data of a fixed block length is recorded as is on the optical disk 4, and no check is made for recording regret. This system has a problem in that once a recording error occurs due to track misalignment, not only is there no means to detect the error, but all subsequent data becomes invalid. It is also desired to increase the recording capacity of optical discs.

The present invention has been made in view of the above points, and its purpose is to check and detect recording errors, eliminate those with errors, and realize highly reliable record storage. The object of the present invention is to realize a replacement buffer recording device with an increased width.

(Means for Solving the Problems) The present invention solves the above-mentioned problems in an alternating buffer recording device that records from a magnetic recording means onto an optical disk at high speed by alternately using a plurality of buffer memories. Buffer 7 A data compression means that alternately receives data from the memory and thins out and compresses the data according to a certain rule, and a data compression means that alternately temporarily records the data from the compression means and writes it to an optical disk, and when checking the written data. It is characterized by comprising a plurality of data storage means for reading and recording from the optical disk, a comparison and verification means for comparing and collating data from the plurality of data storage means, and a control means for controlling all processing operations. It is.

(Function) Two sets of multiple storage means are used to transfer data using an alternating buffer method to increase the speed, data compression means is used to compress the data to enable permanent storage, and optical disk recording is performed as necessary. The data is read into the data storage means and checked for errors, and if there is an error, a warning is displayed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which the same parts as in FIG. 4 are given the same reference numerals. In the figure, 5 is an original data read buffer (A>) that reads the original data from the magnetic disk 1 and temporarily stores it, and 6 is an original data read buffer (A) that similarly reads the original data.
Original data read buffer (B) used alternately with 5;
7 is a data compression processing device that compresses the data from the original data read buffer (A) 5 and the original data read buffer (B) 6 based on a certain law that can be restored; Data is input alternately to the compressed data buffer (A) 8'' and the compressed data buffer (B) 9. 10 inputs the data recorded on the optical disk 4 to the compressed data buffer (A) 8 or the compressed data buffer (B). This is a comparison/verification device that reads the data to the empty side of 9 and compares it with the data before transfer.If an error is detected, a warning is displayed on the display device 11. It is a control device that controls what is done.

The operation of the embodiment configured as described above will be explained with reference to the data flow shown in FIG. 2 and the time chart shown in FIG. 3.

Data is read from the magnetic disk 1 to the original data read buffer (A) 5 and transferred (transfer e), and is transferred to the compressed data buffer 8 while being compressed by the data compression processing device 7 (transfer g). At the point when this compression starts, the next data (2) is read and transferred to the original data read buffer 6 (transfer "), and is temporarily stored in the original data read buffer (B) 6. This data (2) ) is compressed by the data compression processing device 7 and stored in the compressed data buffer (
B) Transferred to 9 (transfer g). The transfer of data (2) is performed through a path independent from the transfer of data (1). The timing is as shown in FIG. 3, when reading (2) ends, reading (2) begins, and at the same time data compression (2) begins. When the data compression process ends and the optical disk 4 is loaded and W■ begins, the data buffer (A) 5 starts reading R■, and at the same time data compression P■ of data ■ begins. In FIG. 2, consider the operation in the case where comparison and verification are performed at the end of writing <r> from the compressed data buffer (A) 8 to the optical disc 4. The data that has just been written to the optical disc 4 is now read out to the free compressed data buffer F (B) 9), and compared with the data in the compressed data buffer (A) 8 before transfer (■). n). As a result of the comparison, if they match, the next process is continued. At the verification point enclosed by the dotted line in Figure 3,
When the writing W■' from the compressed data buffer (A) 8 to the optical disk 4 is completed, the data is read R■' to the compressed data buffer (B) 9, and comparison is made at the next hatched stage. If there is no abnormality as a result of the comparison, then the original data buffer (A
) 5 to the data compression processing device 7 R
(2) At the same time, the data compression processing unit @7 reads data from the original monitor read buffer (B) 6, compresses the data, and writes it to the compressed data buffer (B) 9 (P). When this process is completed, write to the optical disc 4 and
From then on, proceed in the same manner. If an error is found as a result of comparison and verification, an error detection warning is issued on the display device 11, and subsequent recording is stopped.

Optical disk storage devices have a large capacity and transfer a large amount of image data, so high-speed processing is required.

In Fig. 3, the shaded part within the straight line area is the part necessary for comparison and verification, but this time becomes the total (dead time) that does not overlap with the data transfer. When matching is performed on all data,
It takes time to record data transfer. It is a relatively easy error to misalign data when writing, but it is not necessary to do this for all data, but for the beginning, middle, and end.
It is sufficient to carry out the test twice, and if there are no errors,
It is determined that the transfer was successful. If an error is detected at that point, the transfer process is stopped and a message indicating that there is an error is displayed. The above processing is controlled by the control device 112.

As described above in detail, when recording on an optical disc that has many advantages, it is essential to store data accurately and at high speed.This example compresses data and allows comparison and verification of data. We have realized a transfer recording system that shortens the transfer time by transferring data in an alternating manner, and if there is an error, it can be detected and waste can be prevented.

(Effects of the Invention) As explained in detail above, according to the present invention, the temporary storage means is divided into two parts, the front and the rear, and the data compression means is arranged in between, so that the storage capacity is increased. By reading the data again immediately after recording and comparing and checking, it is possible to detect and eliminate data recording errors, realizing a highly reliable record storage method, and further increasing the recording capacity through data compression. , and the practical effect is great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing a data flow in an embodiment of the present invention, FIG. 3 is a time chart of an embodiment of the present invention, and FIG. 4 is a diagram showing a data flow in an embodiment of the present invention. 1 is a diagram of a conventional alternate buffer recording method; FIG. 1... Magnetic disk 2.3... Temporary storage buffer 1 4... Optical disk 5.6... Original data read buffer 77... Data compression processing device 8.9... Compressed data buffer 10. ... Comparison verification bag m 11 ... Display device 12
-11t111 device

Claims (1)

[Claims] In an alternating buffer recording device that records from a magnetic recording means to an optical disk at high speed by alternately using a plurality of buffer memories, data compression means receives data alternately from the plurality of buffer memories and thins out and compresses the data according to a certain rule. a plurality of data storage means for alternately temporarily recording data from the compression means, writing it on an optical disk, and reading and recording data from the optical disk when checking the written data; A spacing buffer recording device characterized by comprising a comparison and verification means for comparison and verification, and a control means for controlling all processing operations.