JPS61153875A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate recording operation from a host computer by erasing a recording area when a recording instruction is received and then recording data by a device which records and reproduces information by irradiating a rewritable recording medium with light. CONSTITUTION:A recording and a reproduction instruction for an optical disk 11 on a device 24 are inputted from the host computer 4 as an external device. When the recording instruction is received, a controller 12 inputs an address where information is recorded from the host and accesses an area on the disk corresponding to the address with a light beam to start erasing the area. For the erasure, a recording/reproducing head part 16 accesses the position of the start address where information to be erased is recorded and then a bias magnet driving circuit 22 sets the bias of a bias magnet 21 to an erasure bias to irradiate the area with light from a laser 16a to the erasure quantity of light in said state. The recording start position is accessed with the light beam after the erasure to record recording data. A phase transition type disk is the same and the recording operation is facilitated.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an apparatus for recording, reproducing, and erasing information.

[Prior art]

Conventionally, magnetic disk devices using magnetism have been widely used as information recording/reproducing devices using replaceable recording media. In Fm disc devices, in order to rewrite an area where information has already been recorded, if further recording is performed in that area, the previously recorded information will be erased and only the newly recorded information will remain. For this reason, there was no need to perform any particular erasing operation. However, in recent years, as opportunities to handle large amounts of data such as image information have increased, magneto-optical disks and phase change disks have been considered as rewritable recording media with larger recording capacities. In these recording media, in order to record information, the device is configured such that new information is recorded in an area where information has been erased. For this reason, information recording and reproducing devices that use this type of media are required to perform ``erase'' and ``erase'' operations in addition to ``record'' and ``replay,'' which were used with magnetic disks, as commands from the host computer connected to the device. ” command had to be added, and it was not compatible with conventional magnetic disks as is.

〔the purpose〕

The present invention eliminates the above drawbacks, and performs recording after erasing the information in the recording area once a recording command is received.
The object of the present invention is to provide a device that can be used in the same way as a magnetic disk as a host computer.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration block diagram showing an embodiment of the present invention, where l is a large capacity information storage means for storing file information, and a sector 1c for storing management information 1b for each file information 1a to be stored. - ~ are provided. 2 is a control means for controlling input/output signals, and 3a is a non-volatile (backed up) RAM, which is a large capacity information storage means l.
The management information 1b stored in each sector lc above is read, and newly created management information is stored. 3b is a management information rewriting means for rewriting the file information 1a corresponding to the management information 1b stored in the memory means 3a from "read only" to "erasable"; and 4 is a management information rewriting means for rewriting the file information 1a corresponding to the management information 1b stored in the memory means 3a; This is an external device for inputting instructions for recording, reproducing, and erasing file information 1a to be stored. The large-capacity information storage means 1 is a rewritable recording medium, such as a magneto-optical disk, and the stored information files can be read, written, and erased at any time. Further, the management information tb of the present invention is the management state of the file information 1a, for example, "recordable J, r read only", "erasable"
There is a heading indicating.

The information file deletion operation will be explained below.

When an erase instruction to erase the file information 1a in the large-capacity information storage means 1 is input from the external device 4, the management information 1b of the file information 1a to be erased is transferred from the sector IC to the RAM.
3a, the control means 2 sends out a command to read the management information tb to the RAM 3a, and the management information rewriting means 3b rewrites the management information 1b from "read-only" to "erasable", thereby updating the newly created management information. The information 1b is stored again in the sector lc from which it was read.

FIG. 2 is a configuration block diagram of an information management system to which this invention is applied, where 4 indicates the same thing as in FIG. 1, and 11
12 is a magneto-optical disk device, and 12 is a controller that sends a disk rotation ON signal to a disk motor drive circuit 13 to rotate a motor 14 at a constant angular velocity. A laser modulation circuit 15 modulates the beam from the laser 16a of the recording/reproducing head section 16. The recording/reproducing head section 16 is composed of an objective lens 16b, a half mirror 16c, and an analyzer 16d. 17 is a reproduction signal demodulation circuit for reproducing a signal from the reflected light from the magneto-optical disk device IT; 18 is a focus/tracking control circuit which drives the objective lens 16b to perform focus, VJ if, and tracking control; The head motor is driven by a head motor drive circuit 20 in response to a head drive command from a controller 12 . Reference numeral 21 denotes a via magnet, which is driven by a bias magnetic drive circuit 22. 23 is an interface circuit that sends reproduction information to the external device 4. Note that a tracking guide groove and an address signal that cannot be erased are recorded in advance on the magneto-optical disk device 111h. Note that the part surrounded by the broken line 24 is compatible with a combination of a conventional magnetic disk device controller and a magnetic disk drive device.

Next, the operation will be explained. If the magneto-optical disk unit 211 is waiting for a recording, playback, or erase mode instruction while it is rotating, it receives an instruction from the controller 12 and
A laser modulation circuit 15 modulates the beam intensity of the laser 16a to cause it to emit light at the optical output during reproduction. The beam at this time is focused on the magneto-optical disk unit 911 by the objective lens 16b, and the reflected light from the magneto-optical disk unit all is reflected by the half mirror 16c and enters the analyzer 16d.
The signal from the analyzer 16d is input to the focus/tracking control circuit 18, which drives the objective lens 16b to perform focus control and tracking control.The signal from the analyzer 16d is also input to the reproduced signal demodulation circuit 17. The address of the current recording/reproducing head unit 16 is reproduced.

The beam position on the magneto-optical disk device GTTP is input to the controller 12.

During recording, the head motor is driven to drive the recording/reproducing head unit 16 to an address instructed by the external device W4 or the controller 12 near the target address based on the difference obtained by comparing the target address and the standby address. Circuit 20 drives Herad motor 19 . Then, the beam position is finely adjusted by driving the objective lens 16b to the final address position. Thereafter, the laser modulation circuit 15 modulates the amount of recording light of the laser 16a according to the instructed information to form a recording pattern. At this time, the bias magnetic drive circuit 22 sets the bias of the bias magnet 21 to the recording bias in response to a command from the controller 12.

During reproduction, after the recording/reproducing head section 16 accesses the position of the start address where desired information is recorded, the reflected light from the magneto-optical disk device 11 is guided through the analyzer 16d, and the reproduced signal demodulation circuit 17 demodulates the signal and sends a reproduced signal from the interface circuit 23 to the external device 4. At this time, the bias magnetic drive circuit 22 sets the bias JIEi 21 (7) to zero.

Note that the disk mounted in the magneto-optical disk device II used is as shown in FIG.
It is managed by addresses for each sector area. Also,
Management information for identifying information recorded on the disk in the magneto-optical disk device 11! b is recorded in a predetermined area on the magneto-optical disk device 11. The original information is recorded sequentially from the outer circumferential direction to the inner circumferential direction of the magneto-optical disk, and the original information is recorded sector by sector over a plurality of sectors. On the other hand, management information is recorded from the inner circumferential direction to the outer circumferential direction, and is recorded in units of sectors.

FIG. 4 shows a control flow diagram of the controller 12 of the magneto-optical disk device. When the device 24 is powered on, control starts (step 31), and each register is initialized (step 32). Next, the routine enters a routine that waits for a command input from the host computer 4, which is an external device (step 33). When a command is input, it is determined whether it is playback, recording, erasure, or the status of the disk device (execution status, error, etc.). ) is determined to be a command for monitoring (steps 34 to 37), and if none of the above applies, a message indicating that there is an error in the command is returned to the host (
Step 40).

If it is a disk device status monitoring command, the status is returned to the host (step 38).If it is a recording command, the host computer reads the management information and determines the recording area, and the controller 12 sends the recording address from the host. When the address is input (step 41), the light beam is accessed to the area on the disk corresponding to this address, and erasing of this area is started (step 42).

When erasing, after accessing the recording/reproducing head unit 16 to the start address position where the information to be erased is recorded,
This is performed by irradiating the laser 16a with an amount of erasing light while the bias magnetic drive circuit 22 sets the bias of the bias magnet 21 to the erasing bias according to a command from the controller 12.

That is, a command to delete file information 1a (FIG. 1) is given, and file la is substantially deleted. While the light beam is being accessed for erasing, record data is input from the host computer (step 43), waiting for erasure to be completed (step 44), and then the light beam is accessing the recording start position. (Step 45), waits for the access to end (Step 46), and when the access ends, records data in that sector (Step 48), and plays back the data in the area on the disk corresponding to the playback address. Step 49), and return this playback data to the host computer (Step 50).

Although the above explanation was made using a magneto-optical disk device, the same can be applied to a phase change type disk.

On the other hand, when the host computer 4 receives an instruction to reproduce information from its input unit (keyboard, etc.), it sends a reproduction command to the device 24, and when it receives an instruction to record or erase, it sends a recording command.

That is, since erasing is the same as recording no data, only management information is recorded as an "erased group".

〔effect〕

As explained above, according to the present invention, by having the device configuration as described above, even in an information recording/reproducing device using a type of medium that cannot be recorded on until it is erased once, it is possible to access information from the host computer. can be used in the same way as conventional magnetic disks. ″

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
3 is a block diagram showing an example of the configuration of an information management system to which the present invention is applied, FIG. 3 is a diagram showing a magneto-optical disk, and FIG. 4 is a flowchart showing control of a controller.

Claims (3)

[Claims] (1) An optical information recording and reproducing apparatus that records and reproduces information by irradiating light onto a rewritable recording medium, which performs recording after erasing a recording area upon receiving a recording command. (2) The information recording and reproducing apparatus according to claim 1, wherein the recording medium is a magneto-optical medium. (3) The information recording and reproducing apparatus according to claim 1, wherein the recording medium is a phase change type medium.