JPS61113102A - Information recording reproducing device - Google Patents

Abstract

PURPOSE:To prevent to vanish control information concerning the information file even when the cutting of an electric power source, power failure, etc., by installing a memory means to store an address, a flag condition storing means, and a control information storing means to store the control information newly prepared to a non-volatile information storing means. CONSTITUTION:In a large capacity information storing means 1 to store file information, sectors 1a... to store the control information for the stored file information each are installed. A non-volatile (to be backed up) RAM3, an information storing means, reads the control information stored at a memory means 3a to store an address where respective sectors 1a on the large capacity information storing means 1 exist, and respective sectors 1a on the large capacity information storing means 1, and stores the control information repared newly. The large capacity information storing means 1 is recording media which can be rewritten, for example, composed of a light magnetic disk, etc., and the information file to be stored can be read, written and vanished at any time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing apparatus that records, reproduces, and erases information using a rewritable recording medium.

[Prior art and its problems]

Conventionally, magnetic disks using magnetism have been widely used as information recording/reproducing devices using rewritable recording media. In these devices, when additional information is recorded in an area where information has already been recorded, the previously recorded information is erased and only the newly recorded information remains, so a special information erasing operation is required. It was good to do it.

However, there are magneto-optical disk devices, phase change disks, etc. as rewritable recording media that have a larger storage capacity than magnetic disks, but when rewriting information that has been recorded on these media, it is necessary to rewrite the information. Information existing in the recording area.

The data must be erased first, and then new information must be recorded in the vacant area.

By the way, normally when recording information on a storage medium,
Management information serving as a table of contents of recorded information is stored on a storage medium. This management information includes the file name of the information to be stored,
The recording length, the sector address serving as the storage address, whether the recording can be erased, etc. are recorded. Therefore, in order to rewrite one piece of information, it is necessary to also record management information regarding that information. In this case, if the power is cut off due to trouble or other reasons after the management information has been deleted, information regarding the recording area on the recording medium corresponding to the deleted management information will be lost, and information on the recording, reproduction, or recording of information in this area will be lost. There are drawbacks such as the fact that erasure cannot be performed and the recording area of the magneto-optical disk device cannot be used effectively.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks, and includes a memory means for storing a write address of management information regarding file information written on a large-capacity information storage means in response to recording and reproduction of file information; A flag state storage means for storing the setting state of a flag indicating the management state of the management information and a large capacity information storage means for reading out the management information written in the large capacity information storage means according to the setting state of the flag, and creating newly created management information. By providing the management information storage means to be stored in a non-volatile information storage means, it is possible to prevent the loss of management information that occurs due to troubles such as power outages, and to manage file information stored on the large capacity information storage means. An object of the present invention is to provide an information recording/reproducing device that can perform pseudo erasure on information.

Embodiments of the present invention will be described below based on the drawings.

〔Example〕

FIG. 1 is a configuration block diagram showing an embodiment of the present invention. Reference numeral 1 denotes a large capacity information storage means for storing file information, and a sector 1a for storing management information for each stored file information is provided. It is provided. 2 is a control means, 3 is a non-volatile (backed up) RAM which serves as an information storage means of the present invention, and a memory means 3a for storing the address where each sector 1a on the large-capacity information storage means 1 exists, and a large-capacity RAM. A management information protection RAM 3b which reads the management information stored in each sector 1a on the information storage means 1 and stores newly created management information, that is, a management information protection RAM 3b which serves as the management information storage means of the present invention, and large capacity information. Storage means 1
The management state 1 of the management information stored in each sector 1a above, for example, the flag state storage means 30 that stores the setting state of a flag 4 indicating whether or not there is file information that can be deleted on the large-capacity information storage means 1, etc. configured. 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.

The information file deletion operation will be explained below.

The flag state storage means 3C determines whether there is file information that can be deleted on the large capacity information storage means 1 from the setting state of the flag 4, and if it is determined that it can be deleted, the control means 2 manages the file information. The address of the sector 1a in which information is stored is read out from the memory means 3a, and the management information of the sector 1a specified by the address is read out and stored in the management information protection RAM 3b, and a flag is set on this management information protection RAMab. 4 is set from "read only" to "erasable" 0 Next, new management information is created and this management information is stored in the sector specified by the address stored in the memory means 3a. Then, a flag 4 indicating that the file information has been deleted on the large capacity information storage means 1 is set. As a result, the information file deletion operation is completed without executing the actual file information deletion operation.

FIG. 2 is a configuration block diagram of an information management system to which the present invention is applied, in which 11 is a magneto-optical disk device, 12 is a controller, which sends a disk rotation on signal to a disk motor drive circuit 13, and drives the motor 14 at a constant angular speed. Rotate with . 15 is a laser modulation circuit, which is connected to the recording/reproducing head section 1;
The beam from the laser 18a of No. 6 is modulated. The recording/reproducing head section 16 includes an objective lens 16b and 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 11, and 18 is a focus/tracking control circuit which drives the objective lens 16b to perform focus control and tracking control. Reference numeral 19 denotes a herad motor, which is driven by a head motor drive circuit 20 in accordance with a head drive command from the controller 12 . A bias magnet 21 is driven by a bias magnetic drive circuit 22.

23 is an interface circuit that sends reproduction information to an external device 24; Note that a tracking guide groove and a non-erasable address signal are prerecorded on the magneto-optical disk device 11. Next, the operation will be explained.

If the magneto-optical disk device 11 is waiting for a recording, playback or erasing mode instruction while it is rotating, the laser modulation circuit 15 receives an instruction from the controller 12 and changes the laser modulation circuit 15 to the laser 1.
The beam of ea is modulated to emit light using the optical output during reproduction. The beam at this time is focused on the magneto-optical disk device 11 by the objective lens 16b, and the reflected light from the magneto-optical disk device 11 is reflected by the half' mirror 16c and enters the analyzer 16d. A signal 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 sent to the reproduction signal demodulation circuit 17, which reproduces the current address of the recording/reproduction head unit 16, and inputs the beam position on the magneto-optical disk device 11 to the controller 12. are doing.

During recording, the head motor is driven to drive the recording/reproducing head unit 16 to an address instructed by the external device 24 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 R bias according 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 reproduction information from the interface circuit 23 to the external device 24. Note that at this time, the bias magnetic drive circuit 22 sets the bias of the bias magnet 21 to zero.

When erasing, after accessing the recording/reproducing bed section 16 to the start address position where the information to be erased is recorded,
This is carried out by irradiating the laser lea 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.

Note that in the magneto-optical disk device 11 used, each track is divided into a plurality of sectors, as in conventional magnetic disk devices, and each track is managed by an address for each sector.

Further, management information for identifying information recorded on the magneto-optical disk device 11 is recorded in a predetermined area on the magneto-optical disk device 11. Further, unlike conventional magnetic disk devices, the magneto-optical disk device 11 has a large track density and a large capacity, so management information is also recorded on several dozen tracks.

Next, the information recording, reproducing, and erasing operations will be explained with reference to the flowcharts shown in FIGS. 3(a) and 3(b). Note that (1) to (39) represent each step. Further, Fl is a flag indicating that the management information on the magneto-optical disk device 11 has been erased (Fs=1), and F2 is a flag indicating that there is no file information that can be erased in the management information (F2=1). The flag 1M1 is on the magneto-optical disk device 11 in which the erased management information is stored.

In memory that only stores sector addresses.

M2 is a memory that stores addresses of sectors of each piece of management information written in the magneto-optical disk device 11. Furthermore, each piece of management information is stored in each sector designated by addresses A1 to Amax.

When the device is powered on, initial settings are made for flags used for access such as recording, playback, and erasing, and a flag F2 is set to indicate that there is no file information that can be erased in the management information.
Clear to "0". That is, it indicates that there is file information that can be erased, and also stores the start address Am1n of the sector in which management information is stored in the memory M2 (1). Next, it is determined whether a disk is installed in the magneto-optical disk device 11 (2), and if it is not installed, the flag F1, which indicates that the management information on the magneto-optical disk device 11 has been erased, is set to “0”. Clear 3)
When the eject switch is pressed to set a disk in the magneto-optical disk device 11, a cover (not shown) is opened and the process waits for the disk exchange to be completed (4), and preparations for disk exchange are made. When the process is completed, the disk is released from the turntable of the spindle (not shown) (5), and the disk is waited for to be installed in the magneto-optical disk device 11 (6). After the installation is completed, the disk is turned on the spindle (not shown). Lock it tightly to the table (7), and step (
14) Haejanbu.

On the other hand, as determined in step (2), the magneto-optical disk device 1
If a disk is installed in 1, the flag Fl is "
8.
), if the flag F is "1", that is, if the management information is erased on the track of the disk, the memory M1 that stores the address Al of the sector where the erased management information is stored indicates. Erase the contents of the sector 8)
Store the contents of the management information protection RAM 3b in the erased sector (10), and then store the contents of the management information protection RAM 3b in the deleted sector.
After rotating the magneto-optical disk unit 11 once, reconfirm whether the contents of the flag F have been correctly stored.
Clear 1 to "0" (12) t, that is, leave the management information stored on the disk and judge whether or not to replace the disk (13). If YES, return to step (5). , if NO or step (8)
If the determination is NO, it is determined whether there is a recording instruction from the external device 24 (14), and if it is YES, the address of the sector in which the management information of the file to be stored is stored is written in the memory M1 (15), and the address A is stored. , and reproduces the management information of the sector stored in the management information protection RAM 3.
b (113), and RA for management information protection.
Create new management information on the MSb and set the area of this file from "recordable" to "read only" (17
), then set the flag F1 to rlJ, record the file to be recorded (1θ), confirm the stored information (2o), and then record the management data stored in the sector given by address A1. Return to step (8) to rewrite the information.

On the other hand, if it is determined in step (14) that there is no recording instruction from the external device 24, it is determined whether a reproduction instruction has been issued from the external device 24 (21), and if YES, an information reproduction operation is performed (22). , return to step (14).

On the other hand, if it is determined in step (21) that no reproduction instruction has been issued from the external device 24, the erasure instruction has not been issued from the external device 24.
23), and if YES, clear the flag F2 to "0" 20. In other words, the management information should contain information that can be erased, and the start address Am1n should be stored in the memory M2 (25).
, writes the address of the sector in which the management information of the file to be erased is stored in the memory M1 (26), reproduces the management information of the sector given by the address A1 and writes it to the management information protection RAM 3b (27), and Rewrite the management information of the file to be deleted on the management information protection RAMab from “read only” to “erasable” (28);
Next, flag F1 is set (28), and address A,
Return to step (8) to rewrite the management information stored in the sector given by.

On the other hand, if it is determined in step (23) that no erasing instruction has been issued from the external device 24, then it is determined whether the flag F2 is set to "1" (30).
If it is set to lJ, go to step (13),
If flag F2 is set to rOJ, memory M2
The contents of are written to memory M (31). Next, the management information stored in the sector given by the address stored in the memory is reproduced and the management information protection RA
Write to M3b (32). Then, determine whether there is a “deletable” file in the management information33)
, if the file does not exist, the address of the sector that stores management information is the final access address A wax
Judge whether the above is true34), and if YES, flag F.
2 to rlJ35), if No, memory M2
Add 1 to the contents of (36) and go to step (13).

On the other hand, if there is a "deletable" file in the management information as determined in step (33), that file information is deleted from the disk (37), and then the management information of the deleted sector is protected as management information. Rewrite “erasable” to “recordable” on RAMab (38), and set flag F to “
1" and go to step (8) (39).

In this way, when an erasure instruction is sent from the external device 24, the management information is only changed from "read only" to "erasable", and the magneto-optical disk device 11 in the "erasable" state is When the above file information is viewed from the external device 24, the file information does not exist. Further, since the recording/reproducing head section 16 is normally located on the track where the management information of the magneto-optical disk device 11 is stored, the information file erasing operation according to the present invention can be performed within a short time.

〔Effect of the invention〕

As explained above, the present invention includes a memory means for storing an address written on a large capacity information storage means and a writing of management information regarding the file information written on the large capacity information storage means in response to recording and reproduction of file information. A memory means for storing addresses, a flag state storage means for storing the setting state of flags indicating the management state of management information, and a large capacity information storage means for reading out the management information written in the large capacity information storage means according to the setting state of the flags. Since the management information storage means for storing the management information created in the non-volatile information storage means is provided, even if the power is accidentally turned off or a power outage occurs, the management information regarding the information file will not be lost. This has the advantage of eliminating the inability to record and reproduce file information due to loss of management information.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention, FIG. 2 is a configuration block diagram of an information management system to which this invention is applied, and FIGS. 3(a) and (b) illustrate control operations of this invention. It is a flowchart explaining. In the figure, 1 is a large capacity information storage means, 2 is a control means, and 3 is R.
AM, 3a is memory means, 3b is RAM for management information protection
, 3C is a flag state storage means, 4 is a flag, 11 is a magneto-optical disk device, 12 is a controller, 13 is a disk motor drive circuit, 14 is a motor, 15 is a laser modulation circuit, 16 is a recording/reproducing head section, 16a is a laser , 16b is an objective lens, 16c is a half mirror, 116d is an analyzer,
17 is a reproduction signal demodulation circuit, 18 is a focus fist tracking control circuit, 19 is a Herad motor, 2Q is a Herad motor drive circuit, 21 is a bias magnet, 22 is a bias magnetic drive circuit, 23 is an interface circuit, and 24 is an external device. . Figure 1 Figure 2 F2 Figure 3 (a) Figure 3 (1))

Claims (1)

[Claims] In an information recording and reproducing apparatus that stores file information in a large-capacity information storage means that can be read and written at any time and records and reproduces the file information, the information is written on the large-capacity information storage means in accordance with the recording and reproduction of the file information. A memory means for storing a write address of management information regarding the file information, a flag state storage means for storing a setting state of a flag indicating a management state of the management information, and the management information written in the large capacity information storage means. 1. An information recording and reproducing apparatus characterized in that a non-volatile information storage means is provided with a management information storage means for reading out the management information according to the setting state of the flag and storing newly created management information.