JPS63129586A - Information storage device - Google Patents

Abstract

PURPOSE:To maintain a permanent logical storage position by providing a control means which reads and writes information on a rewrite disabled recording medium and a conversion means which converts the logical block number of an information recording area into a physical block number. CONSTITUTION:When a request to write information is issued, the control means 5 instructs the given logical block number conversion means 4 in the same way as a request to read information is issued. The means 4 searches an idle block in a recording medium 1, and an obtained physical block number R returns a given logical block number R. Afterwards, the control means 5 instructs a recording and reproducing means 2 to write information in the recording area with the physical block number R, whereby the information is written in an area with a logical block number Li. Upon the completion of all read and write actions, a conversion table control means 6 stores the contents of a block number conversion table 3 in an external memory. Thus the control that ensures the permanent logical storage position after update is attainable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information storage device used for secondary storage in computer equipment.

2. Description of the Related Art Conventional information storage devices utilize magnetic tapes, magnetic disks, and magnetic drums, which are rewritable and basically have only a recorded state. Therefore, there was no problem in updating information.

Problems to be Solved by the Invention However, the write-once type has the states of unrecorded and recorded, and although information can be written to the recording area in the unrecorded state, information cannot be rewritten to the recording area in the recorded state. Optical discs have a problem in that conventional techniques cannot be applied as is to optical discs due to their inability to be updated. This problem can be solved by allocating a new block every time an update request is made, but this poses the problem that the physical storage location moves every time an update is made.

In view of the above, an object of the present invention is to provide an information storage device for a write-once optical disc that handles recording areas logically and controls the logical storage position so that it does not change even after updating.

Means for Solving the Problems The present invention provides a control means for reading and writing information on a non-rewritable recording medium, and a block number conversion means for converting a logical block number of an information recording area into a physical block number. It is an information storage device equipped with.

Effect of the Invention With the above-described configuration, the present invention performs an external read/write request for information using a logical block number, and internally converts the given logical block number into a physical block number before performing an information read/write operation, thereby producing a write-once optical disc. It can also be handled in the same way as conventional recording media.

The embodiment diagram shows a block diagram of an information storage device in an embodiment of the present invention. In the figure, 1 is a non-rewritable recording medium, 2 is a recording/reproducing means, 3 is a block number conversion table, 4 is a block number conversion means, 5 is a control means, 6 is a conversion table management means, and 7 is an external storage. be.

The operation of the information storage device of this embodiment configured as described above will be described below.

In the initial state, the contents of block number conversion table 3 are not guaranteed. The conversion table management means 8 reads information from the external storage 7 and stores the logical block number ←→ in the block number conversion table 3.
Set physical block number correspondence information. Information is read and written to and from the recording medium 1 in units of physical blocks by the recording and reproducing means 2. Here, the conversion from logical block number Ln to physical block number Fn is represented by f, and Fn=f
(Ln).

When requesting to read information, the control means 6 instructs the block number conversion means 4 to convert the given logical block number L1 into a physical block number. The block number conversion means 4 uses the block number conversion table 3, Fi=f(L
) and returns the physical block number Fi. After this, the control means 5 causes the recording/reproducing means 2 to write the physical block number F.
An instruction is given to read information from the recording area of i, and the information of logical block number L1 is read.

When requesting to write information, the control means 5 instructs the block number converting means 4 to convert the given logical block number Li into a physical block number, similarly to when requesting to read information. The block number conversion means 4 searches for an empty block (unused block) in the recording medium 1, and converts the obtained physical block number R so that it satisfies the relationship R=f'(Li) with the given logical block number Li. Update block number conversion table 3 and return physical block number R. After this, the control means 3 causes the recording/reproducing means 2 to write the physical block number H.
The information is written to the logical block number Li.

After all reading/writing processing is completed, the conversion table management means 6 stores the contents of the block number conversion table 2 in external storage.

Although the external storage 7 has been described here as being separate from the recording medium 1, it is also possible to use the same medium, and it is also possible to complete the external storage 7 with the recording medium 1.

As described in detail, according to the present invention, information stored on a write-once information recording medium can be updated in the same way as conventional magnetic recording media, and its practical effects are great.

[Brief explanation of the drawing]

The figure is a block diagram of an information storage device according to an embodiment of the present invention. 1... Recording medium, 2... Recording and reproducing means, 3... Block number conversion table, 4...
Block number conversion means, 6... Control means, 6.
... Conversion table management means, 7... External storage.

Claims (1)

[Claims] Information recording and reproducing means reads and writes information to and from an information recording area formed on a non-rewritable recording medium that has an unrecorded and recorded state, and a logical storage position (logical block number) of the information recording area. ) into a physical storage location (physical block number), and after converting a given logical block number into a physical block number by the block number conversion means, to the target information recording area. An information storage device comprising: control means for instructing the information recording/reproducing means to read or write information.