JP2000306329A - Disk and disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an illegal copying while the convenience of a fair user is being maintained by a providing a plurality of grooves which are aligned in the circumferential direction with a first groove which expresses prescribed data by means of a prescribed interval and a prescribed length. SOLUTION: The groove of this disk is provided with a data property in its arrangement, and an optical signal which is reproduced regarding the groove expresses prescribed data. A groove arrangement which is provided with a function for illegal copying prevention expresses, e.g. key information which permits an installation. Prescribed data which is container in an installation program is transferred to a CPU 210 so as to be stored in a second memory 230. In response to this, the CPU 210 operates an optical head out of a head 260 so as to read out the groove arrangement. The CPU 210 judges whether the prescribed data which is stored in the second memory 230 certifies data in the groove arrangement or not. When the CPU 210 does not certify the data, it reports a CPU in a personal computer to the effect so as to be displayed on a display or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a floppy disk of an optical servo system is composed of a base film and a magnetic material in the same manner as a floppy disk. A zone bit recording (ZBR) system is used as a physical format, and servo grooves (fine concave grooves) are provided so that the magnetic head can accurately move (track) a fine track. The physical format refers to the arrangement of blocks (sectors) in which signals are recorded. In the ZBR system, a ZCAV (Zone Constant Angular) of an optical disc is used.
ar Velocity) system, the number of sectors differs for each zone, and the rotation speed is constant at the inner and outer circumferences. Z
The BR system achieves high recording density on the inner and outer circumferences of the media,
The feature is that the seek time is short.

FIGS. 5 to 7 show typical configurations of grooves and sectors of a conventional optical servo type floppy disk. FIG. 5 is an enlarged plan view of a conventional optical servo type floppy disk 10 and a part thereof. As shown in FIG. 1, the optical servo type floppy disk 10 has grooves 12 and tracks 14 aligned in the circumferential direction. FIG. 6 is an enlarged view of the groove 12 and the optical signal corresponding to the light reflected from the groove 12 shown in FIG. The optical servo type floppy disk characteristically employs laser servo. That is, the groove is irradiated with laser light, and the intensity of reflected light that changes depending on the presence or absence of the groove is detected to perform tracking servo. For example, 2,490
An optical track density of tpi is realized. At present, the number of grooves is defined as 1666 / round, 930 grooves / surface, and the duty ratio is 50%.

FIG. 7 shows a typical arrangement of the sectors 16 in the track 14 shown in FIG. Each sector 1
6 is distinguished by a sector number. As shown in FIG. 7, the sector numbers are arranged while being incremented from 1 in order. The arrangement of such sector numbers is the same for any disk.

[0005]

The information stored in an external storage device such as an optical servo type floppy disk is typically software, but unlike a tangible object, it is easy to copy (copy). It has the feature that it can be provided to the other party while holding the same thing on its own.
For this reason, it has been necessary to prevent copying (illegal copying) by a person who does not have the proper authority. On the other hand, for example, it is conceivable to adopt a copy protection technique that has been conventionally proposed. However, copy protection technology impairs the comfort of legitimate users, such as the inability to back up or install on a hard disk.

[0006] It is preferable to prevent a person who does not have a proper authority from accessing information stored in an external storage device.

[0007]

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, the present invention exemplifies to provide a disk and a disk device capable of preventing unauthorized copying and increasing confidentiality while maintaining the convenience of a legitimate user. Aim.

[0009] To achieve the above object, the first aspect of the present invention is as follows.
A disk as an exemplary aspect of the present invention has a track aligned in a circumferential direction, and a plurality of grooves aligned in the circumferential direction, wherein the plurality of grooves have a predetermined interval and a predetermined length. It has a first groove representing data. A first exemplary aspect of the present invention provides a novel disc having information in a groove that does not have information conventionally. A disc according to a first exemplary aspect of the present invention includes, as predetermined data, information different from information included in a track. Such predetermined data can be associated with information included in the track.

[0010] A disk according to a second exemplary aspect of the present invention has a plurality of circumferentially aligned tracks, the tracks including a plurality of sectors numbered with sector numbers, and the plurality of sectors. Has a first sector representing predetermined data by an array of the sector numbers in the circumferential direction. A second exemplary aspect of the present invention provides a novel disk having information in a sector number array that has no information in the prior art. A disc according to a second exemplary aspect of the present invention includes, as predetermined data, information different from information included in a track. Such predetermined data can be associated with information included in the track.

[0011] A disk drive according to a first exemplary aspect of the present invention includes a track aligned in a circumferential direction;
A disc having a plurality of grooves aligned in the circumferential direction, wherein the plurality of grooves have a track and a track of the disc having a first groove representing predetermined data by a predetermined interval and length. A head that can access the groove, a signal processing circuit that processes a signal read from the disk by the head, a drive unit that drives the disk, the head, and the signal processing device; the optical head; and the signal processing. A control unit for controlling the operation of the device and the driving unit, wherein the control unit reads the disk by the head based on the predetermined data read by the head and reproduced by the signal processing circuit. Control processing. The disk device according to the first exemplary aspect of the present invention includes the above-described first aspect of the present invention.
And is compatible with a disc, which is an exemplary aspect of the present invention, and controls the processing of the disc by the head based on predetermined data.

A disk drive according to a second exemplary aspect of the present invention is a disk having tracks aligned in a circumferential direction, wherein the tracks include a plurality of sectors assigned sector numbers. The plurality of sectors process a head which can access a disk having a first sector representing predetermined data by an array of the sector numbers in the circumferential direction, and a signal which the head reads from the disk. A disk device comprising: a signal processing circuit; a drive unit that drives the disk, the head, and the signal processing device; and a control unit that controls operations of the optical head, the signal processing device, and the drive unit. The control unit is configured to read the predetermined data read by the head and reproduced by the signal processing circuit based on the predetermined data. Controlling processing of the disk by head. The disk device according to the second exemplary aspect of the present invention is compatible with the disk according to the above-described second exemplary aspect of the present invention, and controls the processing of the disk by the head based on predetermined data.

Other objects and further features of the present invention will be made clear by the embodiments described below with reference to the accompanying drawings.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
A magnetic disk 100 according to an exemplary embodiment of the present invention will be described. Here, FIG. 1 is a plan view of the magnetic disk 100. The magnetic disk 100 is a laser servo (tracking) like an optical servo type floppy disk.
The method employs a plurality of grooves 110 and tracks 120.
In the circumferential direction. FIG. 2 is an enlarged view of the arrangement of the grooves 110 and the optical signal corresponding to the light reflected from the grooves 110.

The groove 110 of the disk 100 of the present invention
Differs from the conventional disk 10 in that the arrangement has data characteristics. That is, the optical signal reproduced with respect to the groove 110 represents predetermined data. More precisely, the conventional arrangement of the grooves 12 shown in FIG. 6 has a duty ratio of 50%, and thus has a data characteristic in that it can be used as a reference for clock generation, for example. It is not without intelligibility. However, since the duty ratio is fixed, the information is fixed. Therefore, the arrangement of the grooves 12 shown in FIG. 6 is treated as having no data in the present application.

On the other hand, if the conventional groove 12 is modulated, a clock cannot be generated, and the recording / reproducing compatibility of the disk 100 may be lost. However, the present inventor has noticed that the conventional disk 10 has about 930 grooves 12, and only about 770 of the grooves 12 are used for clock generation.
It has been found that such a problem can be solved by applying 10 to the remaining 160 lines which are not used for clock generation.

FIG. 3 shows an arrangement of the sectors 130 according to the present invention included in the track 110. In addition,
Either of the arrangements shown in FIGS. 2 and 3 may be selectively replaced with a conventional structure. The sector 130 of the present invention
Characteristically, the arrangement of sector numbers has data characteristics. According to the present invention, it is possible to further expand the arrangement of the track numbers so as to have data characteristics.

The data included in the array of the groove 110 and the sector number can have the following information for preventing illegal copying, information for improving security, and other information. From the standpoint of preventing unauthorized copying, such data is
It has information as a key when installing the stored software on a hard disk of a personal computer, for example. Alternatively, it can be used as a part of a stored program. on the other hand,
From the perspective of improving confidentiality, such data is stored on disk 10
0 can be used as a key for accessing data stored therein. It should be noted that these usages will be described in detail in relation to a disk device described later.
As other information, for example, there is a case where information indicating the name of a maker is inserted and a trademark is given to software as software.

In general, the manufacturing process of the optical servo type floppy disk includes a magnetic paint blending / dispersion / application process, a randomizing / drying process, a mirror finishing process, a hardening / aging process, a slit / punching process, a surface polishing process, and a groove forming process. It includes a process, a case (shell) insertion process, a physical format process, a defect inspection process, a shutter mounting process, and a packaging and shipping process.

In the groove forming step, the groove 110 is written using a laser by a known laser servo writer (including a laser light source, an optical modulator, an objective lens, a turntable, etc.) using a laser. The formation of the groove 110 is an irreversible act of burning off with a laser beam.

The function as a groove (tracking position control and rotation control) can be achieved even if the arrangement of the groove 110 is modulated and the signal component is printed. For example, in the tracking position control, if the shortest value of the groove for a certain time is guaranteed, it is not necessary that the optical signal is continuously turned on and off at 50%, and the tracking control can be performed even for an intermittent groove. In the rotation control, control can be performed if a rotation component (rotation clock) can be extracted.

For example, as a modulation method, these conditions (that is, the shortest length of a groove) are determined by a (1, 7) run-length limited coding method ((1, 7) RLLC or (2, 7) RLLC method, 8/9 code, etc.). (1, 7) The RLLC method uses a conversion table as shown in Table 1 below, and the number of consecutive 0s is 1 or more and 7 or less. Is a modulatable code limited to

[Table 1] If the current groove 12 is considered as 1/0 digital information, its capacity is 1666 × 2 × 160/8 = 66 (K
B), the information amount becomes 2 when (1, 7) modulation is applied.
/ 3, but a considerable information amount of 44 (KB) can be stored. Note that the area to which the groove modulation is applied may be limited to a specific area such as the innermost circumference and / or the outermost circumference.

The formation of the grooves 110 is a serial process in which printing is performed one by one on a one-by-one basis, so that on / off processing of the laser light for forming the grooves is easily modulated. Also, one groove at a time on the disc 100 one by one.
The production of 10 does not complicate the production, unlike a disk mass-produced using a stamper and injection molding, such as a CD-ROM or MO disk.

In the physical formatting step, an ID portion and a data portion of each sector are formed by a magnetic signal. I
Section D is an area that cannot be rewritten by the user,
The ID of each sector is identified, and the data portion is formed with information included in the sector together with an error correction code (ECC) and the like. The sector number array according to the present invention is formed by assigning the sector numbers generally included in the ID portion of each sector 130 together with the track numbers in a predetermined array from the disk manufacturing drive and the firmware. The firmware forms a sector number array according to the information to be stored. Also, creating sector number arrays on the disk 100 one by one does not complicate the manufacture of disks, unlike mass-produced disks using stampers and injection molding, such as CD-ROMs and MO disks.

Hereinafter, the disk drive 200 of the present invention will be described with reference to FIG. Here, FIG. 4 is a conceptual block diagram of the disk device 200. Disk device 200
Are a CPU 210, a first memory 220, a second memory 230, a signal processing circuit 240, a driving unit 250
, A head 260, a drive control unit 270, and an interface unit 280, so that the disk 100 and other disks can be detachably stored.

The CPU 210 controls the operation of each unit. The first memory 220 is configured as, for example, a non-volatile memory such as a ROM, and stores an operation program and data of the system together with the control method of the present invention. The second memory 230 is configured as a volatile memory such as a RAM, for example, and temporarily stores information read from the disk 100 by the head 260. Note that the first and second memories 220 and 230 may be configured as one memory device.

The signal processing circuit 240 processes a signal recorded on the disk by the head 260 and a signal reproduced from the disk. The drive unit 250 includes a motor for rotating the disk, a drive mechanism for driving the head 260 and other drive systems, and is controlled by the drive control unit 270 (for example, rotation control of the motor). The interface unit 280 connects the disk device 200 to an external device such as a personal computer as a host device. Here, the head 260
Includes both a magnetic head and an optical head. The other components can employ any configuration known in the art, and thus the detailed structure of each part is omitted here.

First, a groove array having a function for preventing unauthorized copying will be described. In this case, the groove array indicates, for example, key information that permits installation. Consider a case where a user operates an input device (keyboard, mouse, etc.) of a personal computer (not shown) to copy software stored in a disk to a hard disk. First, when the CPU of the personal computer confirms the input of the copy processing, it notifies the CPU 210 of the disk device 200 of the fact. In addition, predetermined data included in the installation program is passed to the CPU 210 and transferred to the second memory 23.
0 is stored. In response, the CPU 210 operates the optical head of the head 260 to read the array of the grooves 110. Thus, the groove array data is reproduced by the signal processing circuit 240 and stored in the second memory 230. The CPU 210 determines whether or not the predetermined data stored in the second memory 230 has authenticated the groove array data, and if not, notifies the CPU of the personal computer of that fact. The case where the predetermined data does not authenticate the groove array data may be, for example, a case where the software from the genuine disk 100 is simply copied to another disk. As a result, the CPU of the personal computer displays this to the user on a display or the like.

On the other hand, the CPU 210
If it is determined that the predetermined data stored in “0” authenticates the groove array data, the software is read out using the magnetic head of the head 260, and the personal computer is read out via the signal processing circuit 240 and the interface unit 280. Send to As a result, the CPU of the personal computer stores the received software on a hard disk (not shown), and displays the fact to the user on a display or the like after the installation is completed.

As described above, although a legitimate user can install software stored on the genuine disk 100 on the hard disk, the genuine disk 10
Software stored in other than 0 cannot be installed in hardware. Note that a method of authenticating the groove array data for the predetermined data can use an authentication method known in the art, and a detailed description thereof will be omitted here.

Next, a groove arrangement having a confidentiality improving function will be described. In this case, the groove arrangement indicates, for example, the user ID. Consider a case where a user operates an input device of a personal computer (not shown) to read out software stored on a disc. First, the CPU of the personal computer
Confirms the input of the reading process, it notifies the CPU 210 of the disk device 200 to that effect. Also, predetermined data included in the reading program is transferred to the CPU 210.
To be stored in the second memory 230. In response, the CPU 210 operates the optical head of the head 260 to read the array of the grooves 110. As a result, the groove array data is reproduced by the signal processing circuit 240 and stored in the second memory 230. CPU 210
Determines whether the predetermined data stored in the second memory 230 has authenticated the groove array data, and if not, the CP of the personal computer
Notify U to that effect. The case where the predetermined data does not authenticate the groove array data may be, for example, a case where the software from the genuine disk 100 is simply copied to another disk. As a result, the CPU of the personal computer displays this to the user on a display or the like.

On the other hand, the CPU 210
If it is determined that the predetermined data stored in “0” authenticates the groove array data, the software is read out using the magnetic head of the head 260, and the personal computer is read out via the signal processing circuit 240 and the interface unit 280. Send to As a result, the CPU of the personal computer can display the received software to the user.

As described above, the person having the genuine disk 100 is assumed to be a valid user, and the genuine disk 1
The groove array data stored in 00 can be used as a key for accessing the software. Such an ID function is provided for each software stored in the disk 100 (file unit, data unit, program unit).
Needless to say, it can be applied to

The same applies in principle to a sector number array having an unauthorized copy preventing function and / or a confidentiality improving function. However, to read the sector number array, the CPU 2
Numeral 10 reads out using the magnetic head of the head 260.
The sector number array indicates, for example, the order of sectors to be read. For example, in response to a command to read six sectors from sector number 0, sector numbers 0, 1, 3, 2, 4
And 5 in that order. In this case, it can be recognized that the arrangement of the sector numbers 2 and 3 of the disk is reversed.

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. For example, the groove array data and the sector number array data of the disk can be used as software stored in the disk device and / or as an access key to the disk device.

[0036]

According to the disk of the present invention, information can be provided in the groove arrangement and / or the sector number arrangement of the disk, and such information can be associated with the information stored in the track. For example, such information can be used to illegally copy information stored on a track or access information stored on a track.

The disk device of the present invention is compatible with the above-described disk, and ensures the effectiveness of a management method using the groove array data and / or sector number data of the disk.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view of a magnetic disk as an exemplary embodiment of the present invention and a part thereof.

2 is an enlarged view of an exemplary groove arrangement of the magnetic disk shown in FIG. 1 and an optical signal corresponding to light reflected from the groove;

FIG. 3 is a block diagram showing an array of sector numbers included in a track of the magnetic disk shown in FIG. 1;

FIG. 4 is a schematic block diagram of a disk device of the present invention.

FIG. 5 is an enlarged plan view of a conventional optical servo type floppy disk and a part thereof.

6 is an enlarged view of an exemplary groove arrangement of the optical servo type floppy disk shown in FIG. 5 and an optical signal corresponding to light reflected from the groove.

7 is a block diagram showing an array of sector numbers included in a track of the optical servo type floppy disk shown in FIG. 5;

[Explanation of symbols]

 Reference Signs List 100 magnetic disk 110 groove 120 track 130 sector 200 disk device 210 CPU 220 first memory 230 second memory 240 signal processing circuit 250 drive unit 260 head 270 drive control unit 280 interface unit

Claims (8)

[Claims] 1. A disk having a track aligned in a circumferential direction and a plurality of grooves aligned in a circumferential direction, wherein the plurality of grooves have predetermined data at predetermined intervals and lengths. A disk having a first groove representing 2. The disk according to claim 1, wherein the first groove is formed by modulating a groove. 3. The disk according to claim 2, wherein the modulation uses a (1,7) run-length limited coding scheme. 4. The disk according to claim 1, wherein said disk is a magnetic disk, and said grooves are used for tracking laser servo. 5. A disk having tracks aligned in a circumferential direction, wherein the tracks include a plurality of sectors each having a sector number, wherein the plurality of sectors are the sector numbers in the circumferential direction. A disk having a first sector representing predetermined data in an array of. 6. The disk according to claim 5, wherein said disk is a magnetic disk. 7. A disk having a track aligned in a circumferential direction and a plurality of grooves aligned in the circumferential direction, wherein the plurality of grooves have predetermined data at predetermined intervals and lengths. A head having access to the tracks and the grooves of a disk having a first groove, a signal processing circuit for processing a signal read from the disk by the head, the disk, the head, and the signal processing device And a control unit that controls the operation of the optical head, the signal processing device, and the drive unit, wherein the control unit is read by the head and performs the signal processing. A disk device that controls processing of the disk by the head based on the first data reproduced by a circuit. 8. A disk having tracks aligned in a circumferential direction, wherein the tracks include a plurality of sectors each having a sector number, and the plurality of sectors include:
A head accessible to a disk having a first sector representing predetermined data by an array of the sector numbers in the circling direction, a signal processing circuit for processing a signal read from the disk by the head; A disk device comprising: a drive unit that drives the head and the signal processing device; and a control unit that controls operations of the optical head, the signal processing device, and the drive unit, wherein the control unit includes the head A disk device that controls processing of the disk by the head based on the predetermined data read by the signal processing circuit and reproduced by the signal processing circuit.