JP2000311450A - Disk and disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rewritable disk which can set the read-only or writable attributes of a sector so that a user cannot change it. SOLUTION: The disk 1 has sectors having a data part 30 and an ID part 10 respectively and sectors corresponding to some of sectors include attribute identifiers for determining a read-only or rewritable state. When the attribute identifier indicates the read-only property, the data of the data part can be read out, but cannot be rewritten and when the attribute identifier indicates the rewritable property, the data of the data part can be rewritten.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to an information record carrier, and more particularly to a sector format of a rewritable disk. The present invention is particularly suitable as a sector format of a next-generation optical servo type floppy disk.

[0002]

2. Description of the Related Art Generally, a rewritable disk is divided into a plurality of tracks in a circumferential direction, and each track is divided into a plurality of sectors. Each sector has an ID part and a data part. The ID section is an area that can be written only by the media manufacturer, and is formed only at the time of physical formatting.
The ID section stores ID data such as a synchronization section (Sync), a track number, a sector number, and a bad sector flag. The data section identifies the data section and stores predetermined data. The data section has an error detection code (EDC) and an error correction code (ECC). The EDC detects whether the data in the data section is correct, but does not correct the error. The EDC (or an alternative functionally similar cyclic redundancy check code (CRCC)) is also included in the ID part, and detects whether the ID data is correct but does not correct the error. The ECC can restore the original data by performing error correction on the data in the data section.

[0003]

At present, there is a demand for storing and selling software on a rewritable disk such as an optical servo type floppy disk having a high storage capacity. In this case, if a function that does not exist in the conventional medium can be realized in the copy product, it can help increase orders. On the other hand, if the user can freely rewrite such new information added to the disc, it is not preferable because it causes problems such as illegal copying. It is also preferable that the user can be prevented from accidentally erasing the software. Further, it is preferable to adopt a configuration that does not infect such software with a computer virus. For example, conventionally, an operating system (OS) also has attribute information on a file basis, but this can be modified on the OS and has not been an effective countermeasure against computer viruses.

[0004]

SUMMARY OF THE INVENTION It is a general object of the present invention to provide a new and useful disk and disk device which can solve such a conventional problem.

More specifically, it is an exemplary object of the present invention to provide a rewritable disk and a disk device capable of setting a read-only or rewritable attribute of a sector.

In order to achieve the above object, a disk according to the present invention is a disk having a plurality of sectors each having an ID section and a data section, wherein the ID section is a read-only or rewritable corresponding sector. Has an attribute identifier for determining whether or not the sector ID corresponds to the sector ID. If the attribute identifier identifies the sector as read-only, the data stored in the data section can be read. Yes, but cannot be rewritten. If the attribute identifier identifies that rewriting is possible, the data in the data section can be rewritten. According to the disc of the present invention, a single disc has a read-only area (that functions as a ROM) and a rewritable area (that functions as a RAM).

Further, according to the present invention, there is provided a method for manufacturing a disk storing predetermined user data to be used by a user, comprising the steps of: writing the user data to a disk; and storing an area of the disk where the user data is written. Setting the attribute to be read-only or rewritable, and setting the attribute to be non-rewritable by the user. According to the manufacturing method of the present invention, whether read-only or rewritable is set for each area where user data is written, not for each user data (that is, not for each file). Therefore, the manufacturing method of the present invention can provide a disk having both a read-only area (that functions as a ROM) and a rewritable area (that functions as a RAM) at the same time. The attribute is set so that the user cannot rewrite the attribute. "Unrewritable" means that rewriting is not possible if the user uses a normal disk device, for example, if the user modifies the disk device or uses the same equipment as the manufacturer It should be noted that this does not always mean that rewriting is impossible. The method of making the disk non-rewritable is to write the attribute to the non-rewritable area of the disk (hardware method)
And a method (software method) of instructing that the disk device cannot be rewritten. The manufacturing method of the present invention is used, for example, in a case where predetermined user data is stored after being completed using a disk as a medium, and then provided to a user. Here, the user data includes program data such as an OS used directly by the user, application software, image information, text information, music information, and the like, and security data and management data accompanying the user that are not directly used by the user. For example, if an OS or the like is set to read-only, it is possible to prevent the OS from being infected by a computer virus.

A disk device according to the present invention includes a head capable of accessing a disk having a plurality of sectors each having a data portion, a signal processing circuit for processing a signal read from the disk by the head, the disk, the head, A drive unit for driving the signal processing device; and a control unit for controlling operations of the optical head, the signal processing device, and the drive unit, and the disk is configured such that the corresponding sector is read-only or rewritable. The control unit identifies whether the attribute identifier read by the head and reproduced by the signal processing circuit is read-only or rewritable,
When the attribute identifier identifies that the data is read-only, each unit is controlled so that the head is allowed to read data stored in the data unit, but is prohibited from rewriting.

The disk of the present invention is a disk having a plurality of sectors. Each sector has a data portion and an attribute identifier for determining whether the sector is read-only or rewritable. If it is identified as dedicated, the data stored in the data part can be read but cannot be rewritten. If the attribute identifier identifies that it is rewritable, the data in the data part is rewritten. Disk that allows you to. The attribute setting section may be provided in the data section. As in the case of the above-mentioned disk, a single disk has a read-only area (that functions as a ROM) and a rewritable area (that functions as a RAM) in one disk.

[0010] Other objects and further features of the present invention will become apparent from the embodiments described below with reference to the accompanying drawings.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2,
An optical servo type floppy disk 1 according to a first exemplary embodiment of the present invention will be described. FIG. 1 is a schematic block diagram of a sector format of a floppy disk 1 of the optical servo system. When the disc 1 is played,
The head reads the sectors in FIG. 1 and other figures from left to right. FIG. 2 is an enlarged plan view of the optical servo type floppy disk 1 and a part thereof.
As shown in FIG. 2, the disk 1 has tracks 2 and grooves 4 aligned in the circumferential direction. The disk 1 characteristically employs a laser servo, irradiates the groove 4 with a laser beam, detects the intensity of reflected light that changes depending on the presence or absence of the groove 4, and performs tracking servo, for example, an optical track of 2,490 tpi. The density has been achieved. The number of grooves is, for example, 1666 / circumference, 930 grooves / surface, and a duty ratio of 50%.

As shown in FIG. 1, the disc 1 has an ID section 10, a gap 20, and a data section 30. I
The D section 10 is formed only at the time of physical formatting, and has an ID synchronization section (ID Sync) 12, an ID mark 14, ID data 16, and an ID error detection code (EDC) 18. The ID synchronization unit 12 is a read trigger for hardware for finding the ID mark 14, and has a function of identifying that the ID mark 14 is the ID unit 10.

The ID data 16 is the ID of the corresponding sector.
(Identification information), has information as a bad sector flag, and has an attribute setting unit 17.
The ID data 16 has a size of, for example, 7 bytes, but about 20 bits have not been used in the past. The attribute setting unit 17 is provided using such unused parts. The attribute setting unit 17 identifies whether the attribute of the corresponding sector is read-only (read only) or rewritable. If the attribute setting unit 17 identifies that the data is read-only, the user data in the data byte field 36 becomes read-only and cannot be rewritten. here,
"Cannot be rewritten" means that rewriting is not possible when the user uses a normal disk device,
For example, it should be noted that rewriting is not always impossible even if the user modifies the disk device or uses the same equipment as the manufacturer. Also,
Even if the attribute setting unit 17 identifies that the data is read-only, an ECC 39 described later is used to secure the read itself.
Is preferably configured to be able to perform error correction. If the attribute setting unit 17 identifies that the data is rewritable, the user data in the data byte field 36 is provided to the user in a rewritable manner.

The EDC 18 (or an alternative functionally similar cyclic redundancy check (CRC)) uses the ID
It detects whether the data 16 is correct but does not correct the error. Optionally, the disk 1 may further have a sector synchronization section and a sector mark before the ID synchronization section 12.

The gap (Gap) 20 is inserted as a kind of buffer for absorbing a buffer between sectors for length adjustment, and is provided between the ID section 10 and the data section 30 and between the ID section 10 and the data section 30.
And the next ID section 10.

The data section 30 has a data synchronization section (Data
Sync) 32, a data mark 34, predetermined data (user data) 36, a data error detection code (EDC) 38, and a data error correction code (ECC)
39. The data synchronization section 32 is a read trigger for hardware for finding the data mark 34, and has a function of identifying that the data mark 34 is the data section 30. The user data is stored in the data byte field 36. For example, data that can be recorded and reproduced by the user, such as an OS, software program, image information, text information, music information, and the like created by a manufacturer other than the end user, and the associated user directly It contains information such as security data and management data that are not used. Like the EDC 18, the data EDC 38 detects whether the user data in the data byte field 36 is correct, but does not correct the error. ECC
Numeral 39 can restore the original data by correcting the error of the user data in the data byte field 36.

According to the optical servo type floppy disk 1 of the present invention, a read-only sector (that functions as ROM) and a rewritable sector (that functions as RAM) are included in one disk. Will be mixed. The ID unit 1 in which the attribute setting unit 17 is stored
0 is configured as an area that cannot be rewritten by the user. Therefore, the user cannot freely change the attribute of the sector, and as a result, cannot change the data set to read-only. Here, “unrewritable” means that the ID unit 10 cannot be rewritten when the user uses a normal disk device.
It should be noted that rewriting is not always impossible even if the user modifies the disk device or uses the same equipment as the manufacturer.

A magneto-optical disk 100 according to a first exemplary embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 3 is a plan view of the magneto-optical disk 100. The magneto-optical disk 100 employs a continuous servo (tracking) method, and a polycarbonate substrate 102
A plurality of guide grooves (grooves) 104 for facilitating accurate movement (tracking) of the laser light are provided above. Also, the disk 100 is a continuous servo system,
The present invention can be applied to both land recording and groove recording.

The magneto-optical disk 100 has a plurality of tracks (not shown) spirally in the circumferential direction, and each track is provided with a plurality of blocks called sectors 110. To arrange the sectors (physical format), use CL
V (Constant Linear Velocit)
y) method, CAV (Constant Angular)
Velocity) system, ZCAV (Zone Con)
(Stand Angular Velocity) method,
There is an M-CAV (Modified CAV) method and the like. The disc 100 may adopt any format. This also applies to the disk 200 described later.

The magneto-optical disk 100 may employ any of a single-sided single-layer, a single-sided two-layer, a double-sided one-layer, and a double-sided two-layer structure that is classified according to the recording film and the direction of laser beam irradiation. Can be. This also corresponds to the disk 200 described later.

Hereinafter, the sector format of the disk 100 will be described with reference to FIG. Here, FIG.
FIG. 3 is a schematic block diagram for explaining a sector format of the disk 100 of the present invention. Each sector 110
Includes a preformat unit 120 and a data unit 150.

The preformat section 120 is a field in which data is written by a disk manufacturer before shipment. The preformat unit 120 includes a sector mark (SM) 122 and a VFO (Variable Fres).
frequency Occurrence 124, an address mark (AM) 126, a DA 128, and an ID part 1
30. The sector mark 122 identifies the start of each sector without using a PLL clock. Note that the sector mark 122 may include a sector synchronization unit as a trigger for notifying hardware that a sector is to be read from now. The VFO 124 reliably enables data reproduction even when there is a rotation fluctuation. The VFO 124 has a function of adjusting the frequency and achieving synchronization. The address mark (AM) 126 indicates the head of the address code.

The ID section 130 has a track number 132,
It has a sector number 134 and a cyclic redundancy check code (CRC) 136. The track number 132 and the sector number 134 identify the track to which the corresponding sector belongs and also identify the position in the track. C
The RC 136 checks the error of the ID part.

The flag section 140 has an ODF (Offset)
Detection Flag, Gap (GA
P), including flags. The gap is inserted for adjusting the length as a kind of buffer absorbing the buffer between the fields. The flag indicates, for example, that the sector is a defective sector.

The data section 150 has a VFO 152 similar to the VFO 124, a synchronization section (Sync) 154, and a main data section 156. The synchronization unit 154 is a trigger for notifying hardware that the main data unit is to be read. The main data section 156 includes data including control data, an error correction code (ECC), a CRC similar to the CRC 138, and an attribute setting section 158. The attribute setting unit 158 identifies whether the attribute of the corresponding sector is read-only (read only) or rewritable. As described above, the sector 110 of the present invention characteristically has the attribute setting unit 158. The CRC detects whether there is an error in the data section 150 as described above, and the ECC corrects the error to restore the original data. The CRC is an error detection code (E
DC).

If the attribute setting section 158 identifies that the data is read-only, the data in the main data section 156 of the data section 150 becomes read-only and cannot be rewritten. Here, "cannot be rewritten" means that rewriting is not possible when the user uses a normal disk device.For example, the user modifies the disk device or installs the same equipment as the manufacturer. It should be noted that using this does not mean that rewriting is not always possible. Further, even when the attribute setting unit 158 identifies that the data is read-only, it is preferable that error correction by ECC can be performed in order to secure reading itself. If the attribute setting unit 158 identifies that rewriting is possible,
The data in the data section 150 is provided to the user in a rewritable manner.

The buffer 160 has a function similar to that of the gap, and is inserted for adjusting the length to absorb the buffer between adjacent sectors.

A magneto-optical disk 200 according to a third exemplary embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 5 is a plan view of the magneto-optical disk 200. The magneto-optical disk 200 employs a sample (tracking) method, and has a plurality of guide pits 104 for facilitating accurate movement (tracking) of laser light on the polycarbonate substrate 202.

The sector format of the disk 200 will be described below with reference to FIG. Here, FIG.
FIG. 5 is a schematic block diagram for explaining a sector format of the disk 200 of the present invention. Each sector 210
Are the address field 220 and the data field 26
0 is included. The address field is formed at address 0, and the data field 260 is formed at addresses 1 to n.
(For example, 42).

In the address field 220, the first two bytes are reserved as servo bytes 222, followed by a preformatted address area (ID).
Unit) 230, a reservation area 240, and a laser control area 250.

The address area 230 has a sector mark 2
32, a sector number 234, and a track number 236. The sector mark 232 is added to the sector mark 110,
The sector number is the sector number 134 and the track number 236
Corresponds to the track number 132, respectively, and the description is omitted. The laser control area 250 stores data for controlling laser light.

The data field 260 secures the first two bytes as servo bytes 262, and has a main data section 264 following the first two bytes. Also, the main data section 2
64 has an attribute setting unit 265. Attribute setting unit 26
Numeral 5 identifies whether the attribute of the corresponding sector is read-only (read only) or rewritable. Thus, the sector 210 of the present invention characteristically has the attribute setting unit 265. If the attribute setting unit 265 identifies that the data is read-only, the data in the main data unit 264 becomes read-only,
Cannot be rewritten. When the attribute setting unit 265 identifies that the data can be rewritten, the data in the main data unit 264 is provided to the user in a rewritable manner. Main data section 264
Is a data synchronization unit (Data) corresponding to the synchronization unit 154.
Sync) and a data mark (Data Mark). The data synchronizer is a read trigger for hardware to find a data mark. The data mark identifies the data field 260.

The magneto-optical disks 100 and 200 of the present invention
According to, read-only (ie,
Rewritable with sectors that function as ROM (ie,
(Functioning as a RAM). Further, the attribute setting sections 158 and 265 can be formed in the main data sections 156 and 264 without any problem even in a magneto-optical disk mass-produced by a stamper. It is preferable that the attribute setting units 158 and 265 are set by software so that the user cannot rewrite them. As a result, the user cannot freely change the attribute of the sector.

In the present embodiment, the attribute setting sections 158 and 265 are provided with the main data section 156 of each of the sectors 110 and 210.
And 264, but on disks 100 and 2
The attribute information of a plurality or all sectors may be collectively stored in a management area (not shown) of 00 (called a lead-in area or a lead-out area).

Hereinafter, the discs 1, 100 and 2 of the present invention will be described.
00 will be described. Data bytes 36 and main data portions 156 and 26 of disks 1, 100 and 200
4 includes data directly used by the user such as an OS, software program, image information, text information, and music information created by a manufacturer other than the end user, and security data associated with the user and management data ( User data) is stored. If the attribute setting units 17, 136, and 238 are set to read-only when user data is stored, the contents cannot be freely changed by the user and are prevented from being infected by a computer virus. The inability of the user to freely change the content also prevents data from being erased erroneously. It is also possible to provide a service such that only a person who has a disk storing an old version of the OS for reading only can receive the version upgrade. Also, the disk 1 once set to read-only by the attribute setting unit 17 can be reused if physical formatting is performed again at the factory. In this case, the stored data is also lost, so that important data does not leak to the outside without defense. Needless to say, not all user data must be set to be readable.

Hereinafter, a method of manufacturing a disk of the present invention for storing user data as read-only data will be described. If the disk of the present invention is a DVD-RAM or MO disk, first, the manufacturing steps of the disk medium itself include a stamper forming step, a replica forming step including injection molding, a reflective film forming step, a protective film forming step, and a bonding step. Will be included. On the other hand, the disk of the present invention is a magnetic disk (optical servo type floppy disk, etc.)
It includes a magnetic paint blending / dispersion / application step, a randomizing / drying step, a mirror finishing step, a curing / aging step, a punching step, a surface polishing step, and the like.

Due to the difference in the manufacturing steps described above, the disk 1 of the present invention will be often applied to a magnetic disk. This is because it is premised that MO disks and optical disks are mass-produced by one stamper, and changing information in the ID section is not considered to be a practical method. On the other hand, a magnetic disk does not have such a restriction because there is no step such as injection molding. As a result, as long as the firmware of the manufacturing apparatus and the firmware of the disk device are compatible, it is possible to change and set and use the information of the ID section without any problem as the medium itself. However, as described above, the attribute setting section 15 is added to the main data sections 156 and 264.
8 and 265 are formed on disks 100 and 200
There is no problem if it is configured as an O disk.

The data portion of the completed disk stores the above-mentioned user data. Usually, after writing, the attribute setting unit sets the corresponding sector to read-only.
"After writing" is because user data cannot be written if it is set before writing. It should be noted that not all user data is read-only, but its attributes are set to read-only or rewritable for each sector. This is because, for example, in a game program, there is a case where it is desired to retain past histories so as to be rewritable (for example, only results of high scores that are sequentially replaced). Thereafter, if necessary (that is, the disk 10
If the attribute setting unit is provided in a rewritable area of the disc such as 0 or 200), the attribute setting unit is set by software so that the user cannot rewrite the attribute setting unit. Of course, in the above-described embodiment, the attribute setting section 17 is provided in the ID section which cannot be rewritten by the user, so that this step becomes unnecessary.

Hereinafter, the disk drive 300 of the present invention will be described with reference to FIG. FIG. 5 is a conceptual block diagram of the disk device 300. Disk device 300
Are a CPU 310, a first memory 320, a second memory 330, a signal processing circuit 340, a driving unit 350
, A head 360, a drive control section 370, and an interface section 380, so that the disk 1 can be detachably stored. The disks 100 and 200
Although the description of is not repeated, it goes without saying that the same can be applied to the disk device 300 of the present invention in exactly the same manner.

The CPU 310 controls the operation of each unit. The first memory 320 is configured as, for example, a non-volatile memory such as a ROM, and stores a control method of the present invention, a system operation program, data, and the like. The second memory 330 is configured as a volatile memory such as a RAM, for example, and temporarily stores information read from the disk 1 by the head 360 and a necessary control program.
Note that the first and second memories 320 and 330 may be configured as one memory device.

The signal processing circuit 340 processes a signal recorded on the disk 1 by the head 360 and a signal reproduced from the disk 1. The drive unit 350 includes a motor for rotating the disk 1, a drive mechanism for driving the head 360 and other drive systems, and is controlled by the drive control unit 370 (for example,
Motor rotation control). Interface section 380
Connects the disk device 300 to an external device such as a personal computer as a host device. In addition, since any configuration known in the art can be applied to each component, a detailed structure of each part is omitted here.

Since the head 360 can read all the user data of the disk 1 without restriction regardless of the contents of the attribute setting section 17 of the disk 1, only the write operation will be described here.

At the time of writing, the head 360 first accesses the sector 110 to be written, and
Read. The read information is stored in the second memory 330. The CPU 310 reads the content of the attribute setting unit 17 from the information stored in the second memory 330 and identifies the content. If the CPU 310 determines that the attribute setting unit 17 is set to read-only, it stops writing data according to the control program stored in the first memory 320. Thereafter, the user is urged to end the writing operation via the interface unit 380 and a display of a personal computer (not shown), or the writing operation is automatically ended.

On the other hand, if the CPU 310 confirms that the attribute setting section 17 is set to be writable, the CPU 310 complies with the control program stored in the first memory 320 for each component corresponding to the sector. Instructs to write predetermined data. The CPU 310
Whether the data to be written corresponds to the sector can be determined from the ID mark 14 of the ID section 10. Thereafter, the CPU 310 notifies the user of the completion of the writing operation via the interface unit 380 and a display of a personal computer (not shown) to the effect that the writing has been completed, and automatically ends the writing operation.

When the attribute of a sector is written in the management area, the disk device 300 reads the management area when the disk 1 is inserted to collectively recognize the attributes of all sectors. It can be stored in the second memory 330, and it is not necessary to make a judgment for each sector.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made without departing from the gist thereof.

[0047]

According to the present invention, there is provided a novel disk having a read-only sector (that functions as ROM) and a rewritable (that is, functions as RAM) in one disk. Can be provided. Therefore, the disc of the present invention has the effect of preventing erroneous erasure of data set as read-only and preventing computer virus infection while maintaining the feature that the disc has an area in which the user can write data. . In the disk of the present invention, if the attribute information of the sector is stored in the ID section, the user cannot rewrite the attribute information.

Further, the production method of the present invention can be broadly defined as follows.
A new disk is provided in which predetermined user data is stored and the attribute of an arbitrary area is set to read-only or rewritable. The attribute is set to be non-rewritable by the user. The method of making the attribute non-rewritable includes a method of writing the attribute to a non-rewritable area of the disk (hard method) and a method of instructing the disk device that it cannot be rewritten (software) Method). The manufacturing method of the present invention is used, for example, in a case where predetermined user data is stored after being completed using a disk as a medium, and then provided to a user.

The disk device of the present invention is compatible with the disk described above. In the write operation, the control unit identifies whether the attribute identifier of the ID unit is read-only or rewritable. If the attribute identifier identifies that the attribute is read-only, the control unit transmits the attribute identifier to the data unit. Each unit is controlled so that reading of stored data is permitted but rewriting is prohibited. Thus, the disk device of the present invention ensures the read-only effect set by the attribute identifier. For example, the disk device of the present invention has the effect of erroneously erasing an OS with a read-only attribute identifier.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a sector format of an optical servo type floppy disk as a first exemplary embodiment of the present invention.

FIG. 2 is an enlarged plan view of the optical servo type floppy disk shown in FIG. 1 and a part thereof.

FIG. 3 is a plan view of a magneto-optical disk as a second exemplary embodiment of the present invention.

FIG. 4 is a schematic block diagram of an exemplary sector format of the magneto-optical disk shown in FIG.

FIG. 5 is a plan view of a magneto-optical disk according to a third exemplary embodiment of the present invention.

FIG. 6 is a schematic block diagram of an exemplary sector format of the magneto-optical disk shown in FIG.

FIG. 7 is a schematic block diagram of a disk device of the present invention.

[Explanation of symbols]

 1 disk 10 ID part 17 attribute setting part 20 gap 30 data part 36 data byte 100 disk 130 ID part 132 track number 134 sector number 150 data part 156 main data part 158 attribute setting part 200 disk 220 address field 230 address area (ID part) ) 232 sector mark 234 sector number 236 track number 260 data field 264 main data section 265 attribute setting section 300 disk device 310 CPU 320 first memory 330 second memory 340 signal processing circuit 350 drive section 360 head 370 drive control section 380 Interface section

Claims (7)

[Claims] 1. A disk having a plurality of sectors each having an ID part and a data part, wherein the ID part comprises: an attribute identifier for determining whether the corresponding sector is read-only or rewritable; If the attribute identifier identifies read-only, the data stored in the data part can be read but cannot be rewritten, and the attribute identifier is rewritten. A disc on which data in the data section can be rewritten if it is identified as possible. 2. The disk according to claim 1, wherein said disk is a magnetic disk, and said ID portion is configured to be rewritable by a user. 3. A method for manufacturing a disk storing user data to be used by a user, comprising: writing the user data to a disk; and setting an attribute of an area of the disk on which the user data is written. A method comprising: setting the attribute to be read-only or rewritable; and setting the attribute to be non-rewritable by a user. 4. The disk has a plurality of sectors each having an ID section and a data section, wherein the ID section has an attribute identifier for determining whether the corresponding sector is read-only or rewritable, and Sector I
D data that represents D. When the attribute identifier identifies that the user data is read-only, the user data can only be read. When the attribute identifier identifies that the attribute data can be rewritten, the user data can be read. 4. The method according to claim 3, wherein the user data can be rewritten. 5. A head capable of accessing a disk having a plurality of sectors each having a data portion, a signal processing circuit processing a signal read from the disk by the head, the disk, the head, and the signal processing device. A drive unit that drives the optical head, the signal processing device, and a control unit that controls operations of the drive unit. The disk device determines whether the corresponding sector is read-only or rewritable. An attribute identifier to be determined; the control unit identifies whether the attribute identifier read by the head and reproduced by the signal processing circuit is read-only or rewritable; Permits the head to read data stored in the data section if it is identified as dedicated Disk device that controls each unit so that it is prohibited to rewrite. 6. Each of said sectors further comprises an ID portion,
The said attribute identifier is provided in the said ID part.
The disk device as described above. 7. A disk having a plurality of sectors, wherein each sector has a data portion and an attribute identifier for determining whether the sector is read-only or rewritable, and identifies the attribute identifier as read-only. If the attribute identifier identifies that the data identifier is rewritable, the data stored in the data part can be read but cannot be rewritten, and the data in the data part can be rewritten. disk.