JPH0589588A - Recorded data protection method of rewritable optical disk - Google Patents

Abstract

PURPOSE:To prevent an inadvertent erasure of recorded data during a data recording by detecting the write information which is already recorded in the place to which one wishes to record information. CONSTITUTION:In the inner most periphery of a magneto-optical disk DK, an area is provided to record an information TOC related to recording data and the information is simultaneously recorded while recording the data. A system controller 20 records the TOC which is either write inhibit to recording data or o.k. to write corresponding to the recorded data during a data recording to a rewritable optical disk. And while rewriting with other data, detect the TOC corresponding to the already recorded data in the optical disk which are to be rewritten. When the detected TOC shows write inhibit, that information is displayed in a display section 22 so that the controller 20 performs a system control so that a writing is not going to take place. Thus, the recorded data are protected and an inadvertent erasure is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recorded data protection method for a rewritable optical disk such as a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, a compact disc (hereinafter abbreviated as a CD) is known as an optical disc for reproduction in which acoustic information and various data are recorded. There are two types of CDs used for recording acoustic information, 12 cm in diameter and 8 cm in diameter, and maximum 74 minutes of information is recorded.
In the field of information processing such as computers, it is used as a medium (CD-ROM) for recording a large amount of digital information.

On the other hand, in recent years, a rewritable optical disk based on a magneto-optical recording system, a phase change recording system or the like has been developed. In a magneto-optical disk based on the magneto-optical recording method, information is stored with the perpendicularly magnetized film facing upward and downward, and recording and reproduction of information is performed by laser light. As a magneto-optical disk system, for example, a rewritable magneto-optical disk having a diameter (64 mm) smaller than that of a CD, a reproduction time equivalent to that of a CD, and a recording / reproducing device thereof have been developed (see “Nikkei Electronics [ Nikkei BP]
No. 528 (1991.5.27), pp. 106-107
Page ", and" Radio Technology [Radio Technology Inc.] (6 1991
Monthly issue) pp. 9-12. ). In this magneto-optical disk system, for example, 16 recorded on a CD
Bit data is compressed into 4 bits and recorded.

[0004]

However, in the above conventional magneto-optical disk system, for example, when recording acoustic information, as shown in FIG.
If data (songs) are recorded in k 1, 2, and 3, if another data (song) is recorded in Track 3, for example, the previously recorded data in Track 3 will be erased and rewritten. It was being done. Therefore, the Track data (song) that you want to save in the recorded data
Could be accidentally erased.

The present invention was devised in view of the above problems, and an object thereof is to provide a method for protecting recorded data of a rewritable optical disk which prevents recorded data from being accidentally erased. To do.

[0006]

FIG. 1 shows a flow chart of a recorded data protection method of the present invention. As shown in the flow chart of FIG. 1, a rewritable magneto-optical disk recording data protection method of the present invention for achieving the above object, when writing recording data to a rewritable optical disk, writes the recording data to the rewritable optical disk. Write information indicating either prohibition or writability is recorded corresponding to the record data (S4 to S7), and at the time of rewriting with another record data, the record data to be rewritten which is already recorded on the optical disc. Detecting the write information corresponding to
If the write information indicates that writing is prohibited, rewriting is not performed (S2 to S3).

[0007]

According to the present invention, as shown in the flow chart of FIG. 1, when the recording data is written, the portion to be recorded is first accessed (S1), and at the same time, there is already recorded data at the recording location. The write information of the recording data is detected (S2). Based on the detected writing information, it is determined whether writing to the data already recorded in the recording location is prohibited (S
3). If writing is prohibited, data is not written to the recording location. If writing is not prohibited, data is written to the recording location (S
4). Then, it is determined whether or not there is a write-protection instruction for the written record data (S5). Writing is performed for each recording location of the recording data, or for a location where the contents of the optical disc are collectively recorded.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a block diagram of an embodiment of a magneto-optical disk system for recording / reproducing analog signals such as acoustic information for implementing the present invention. In the figure, DK is a magneto-optical disk having a perpendicular magnetization film. A guide groove is formed in the magneto-optical disk DK, and the guide groove has data (ATIP: Absolute Time InPreg) indicating absolute time information.
wobbling (meandering) at the frequency that is FM modulated by roove)
Is formed. In data writing, information is written by being heated to a Curie temperature or higher by a laser beam and magnetic field modulation being given to the perpendicular magnetization film.

Reference numerals 1 to 22 constitute a magneto-optical disk recording / reproducing apparatus. Reference numeral 1 is a spindle motor that rotationally drives the magneto-optical disk DK, 2a is a magnetic head, 2b is an optical pickup, and an actuator (not shown) that moves in a radial direction of the magneto-optical disk DK in conjunction with the magnetic head 2a and a laser (not shown) It has a light source, a lens, a photodetector, etc., and is a magneto-optical disk D when recording and reproducing data
When K is irradiated with a laser light spot and the data is reproduced, the intensity of the reflected light generated when the polarization plane is slightly rotated by the magnetic Kerr effect in the magneto-optical disk DK irradiated with the light spot is detected, and the intensity is detected. An RF (Radio Frequency) signal obtained by photoelectric conversion is output.

Reference numeral 3 is a spindle servo circuit for controlling the spindle motor 1, 4 is a focus servo circuit for controlling the focus of the light spot from the optical pickup 2b irradiated on the magneto-optical disk DK, and 5 is the magnetic head 2a and the optical pickup 2b. Is a tracking servo circuit for controlling the movement to the track position, and 6 is a head servo circuit for controlling the magnetic head 2a. 7 is an optical pickup 2b
Head amplifier that amplifies the output signal of the head amplifier, 8 is an RF amplifier that generates and outputs a reproduction signal and various signals for control from the output of the head amplifier 7, and 9 is a record that controls the optical spot output of the optical pickup 2b during data recording. It is a drive circuit.

Reference numeral 11 is an ATIP decoder for detecting the wobbling frequency from the output of the RF amplifier 8 when reproducing data, and detecting the temporal position in the magneto-optical disk DK even when information is not recorded. Reference numeral 12 is a signal recorded during data recording. Is converted to an EFM (Eight to Fourteen Modulation) signal and output to the record drive circuit 9, 13 is an EFM decoder that demodulates the read EFM signal output from the RF amplifier 8 during data reproduction, and 14 is data recording A compression encoder that compresses the data amount of a digital signal that is sometimes recorded to about ⅕ using the minimum audible limit characteristic of the human ear and the masking effect,
Contrary to the compression encoder 14, 15 is a magneto-optical disk DK
A compression decoder for demodulating the compressed data reproduced from the original data to the original data, and 16 an A / D converter for converting an analog signal input at the time of recording into a digital signal,
Reference numeral 17 is a DAC for converting the digital signal output from the compression decoder 15 into an analog signal, 18 is a low-pass filter (LPF) for cutting the output signal from the DAC 17 by cutting a predetermined frequency, and 19 is a sound caused by vibration. A DRAM (Dynamic Random Access) for temporarily storing recording data of about 1 Mbit to prevent jumps and the like.
Memory), and the compression encoder 1 when recording data
The output signal of No. 4 is temporarily stored and output to the EFM encoder 12, and when the data is reproduced, the output signal of the EFM decoder 13 is temporarily stored and output to the compression decoder 15.

Reference numeral 20 is a system controller for controlling the entire apparatus at the time of recording and reproducing data, and 21 is an operation unit for inputting operations for recording / reproducing data, such as a recording switch (REC) and a reproduction switch (PLAY). Further, in the present embodiment, an operation switch for instructing write prohibition at the time of recording is provided. Reference numeral 22 denotes a display unit that displays various data when recording / reproducing data.

In the above structure, the signal format of the information recorded on the magneto-optical disk DK is the same as the signal format for the CD. Therefore, the data to be recorded is divided into frame units, and various types of information and control information regarding the recorded data are subcoded for each frame. The subcode recorded by the subcoding is divided into a plurality of continuous frame units to form information. In addition, an area for recording information on recorded data (hereinafter, referred to as TOC: Table of Contents) is arranged at the innermost circumference of the magneto-optical disk DK, and a data recording area (track) and a data length (time) are provided. Various information such as is recorded at the same time when each data is recorded.

For the above recorded information, the magneto-optical disk D is used.
When reproducing K, the system controller 20
Is read out and stored in RAM which is an internal memory, and is used for display and access control. Further, when recording information on the magneto-optical desk DK, the system controller 20 generates and records the contents of sub-coding and updates the contents of the TOC. Furthermore, in this embodiment, when there is an external write-protection instruction for the data to be recorded when the information is recorded, the system controller 2
At the same time as 0, the data to be recorded is recorded as a writing information in the sub-coding or TOC. Next, the control of the system controller 20 relating to the write information will be described.

FIG. 3 shows a control flow chart of the first embodiment of the present invention. In this embodiment, the write information is recorded as a subcode, the subcode of the area to be recorded is detected before the data is recorded, and it is determined whether or not to write to the recording area. Explaining according to the flowchart of FIG. 3, first, it is determined whether or not there is already recorded data in the area to be written (S31). If there is already recorded data, the track subcode in the writing area is read (S32). Next, write information is detected from the read subcode (S33). Then, it is determined whether or not the writing of the already recorded data is prohibited by the writing information (S34). If the writing is prohibited, the fact that the writing is prohibited is displayed on the display unit 22, and as shown in FIG. 5 (1), the process is ended without recording the data (S35). If writing is not prohibited, new data is recorded (written) as shown in FIG. 5B, and the process ends (S36). In S31, if there is no data already recorded, it is assumed that the writing is not prohibited, and the process goes to the step S36 to record the data.

FIG. 4 shows a control flowchart of the second embodiment of the present invention. In this embodiment, the write information is TO
Before recording the data, the write information of the data in the area to be recorded is detected before the data is recorded, and it is determined whether or not the data is written in the recording area. Explaining according to the flowchart shown in FIG. 4, first, it is determined whether or not there is already recorded data in the area to be written (S41). If there is already recorded data, check the contents of the TOC stored in RAM and write the Trac of the area to be written.
The write inhibit data relating to k is read (S42). Then, it is determined whether or not the writing of the already recorded data is prohibited by the writing information (S).
43). If writing is prohibited, the display unit 22
A message indicating that writing is prohibited is displayed and data recording is not performed, and the process ends (S44). If writing is not prohibited, recording (writing) of new data is performed and the process ends (S45). In S41, if there is no data already recorded, it is assumed that the writing is not prohibited, and the process goes to the step S45 to record the data.

[0017]

As described above, according to the present invention,
In a rewritable optical disc, it is determined whether or not the already recorded data may be erased and another data may be written each time the rewriting is attempted.
The recorded data is protected and it is possible to prevent accidental deletion and loss of data.

[Brief description of drawings]

FIG. 1 is a flowchart showing a recorded data protection method of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a magneto-optical disk system for recording / reproducing an analog signal such as acoustic information embodying the present invention.

FIG. 3 is a control flowchart of the first embodiment of the present invention.

FIG. 4 is a control flowchart of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of recording data rewriting.

[Explanation of symbols]

 DK ... Magneto-optical disk 1 ... Spindle motor 2a ... Magnetic head 2b ... Optical pickup 3 ... Spindle servo circuit 4 ... Focus servo circuit 5 ... Tracking servo circuit 6 ... Head servo circuit 7 ... Head amplifier 8 ... RF amplifier 9 ... Record drive circuit 11 ... ATIP decoder 12 ... EFM encoder 13 ... EFM decoder 14 ... Compression encoder 15 ... Compression decoder 16 ... A / D converter 17 ... DAC 18 ... Low pass filter (LPF) 19 ... DRAM (Dynamic Random Access Memory) 20 ... System controller 21 … Operation part 22… Display part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location G11B 20/12 9074-5D (72) Inventor Yukio Kimura 426-10 Hanazono, Tokorozawa, Saitama Prefecture Pioneer In Tokorozawa Plant (72) Inventor Yoshitaka Shimoda 42610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Aikohiko Chosoya Otani 4,2610 Hanazono, Tokorozawa, Saitama Pioneer Tokorozawa In the factory (72) Inventor Tsutomu Sasaki 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa factory

Claims (1)

[Claims] 1. When writing record data to a rewritable optical disk, write information indicating either write prohibition or write enable to the record data is recorded in association with the record data, and another record is made. At the time of rewriting with data, the write information corresponding to the record data to be rewritten which has already been recorded on the optical disc is detected, and when the write information indicates write prohibition, rewriting is not performed. Method for protecting recorded data on optical disk.