JPH04356784A - Rewritable disk - Google Patents

Abstract

PURPOSE:To simply grasp discrimination information for an uncovered disk. CONSTITUTION:On a portion of a rewritable disk 10 not using a case, a user writing area 16 is provided. In the user writing area 16, discrimination information in unit sector groups 14a--14d can be written. The discrimination information can be looked by eye and also is detected with a reading means and is used as a control signal of a disk device. The discrimination information means the discrimination information whether it is a raw disk or a recorded disk the discrimination information whether a recorded disk is a video signal or an audio signal when it is a recorded disk, and erase advisability information for a recorded data, etc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable disk without a case, such as a magnetic disk or an optical disk.

0002

[Prior Art] Floppy disks and optical disk cartridges are all stored in protective cases, but magnetic disks such as compact disks (CDs), optical disks for video, and optical-magnetic disks are only stored once. All rewritable discs, including recordable discs, do not have protective cases (cartridges) and are used as is.

0003

[Problems to be Solved by the Invention] Therefore, with such a rewritable disc, it is difficult to determine whether it is a raw disc or a recorded disc, and if it is a recorded disc, whether the recorded data is a video signal or an audio signal. Since it is not possible to write information such as whether or not recorded data can be erased or not, there have been problems with playback and determining whether or not the disc has already been recorded, or mistakenly erasing data. .

[0004] Therefore, the present invention is an attempt to solve such conventional problems.
This project proposes a disc that can be used to write.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, a user write area is provided in a part of a rewritable disk that does not use a case, and this user write area has a unit sector group. It is characterized by being able to write identification information on it.

[0006]

[Operation] As shown in FIG. 1, a user writing area 16 is provided at a predetermined position on the disc 10. If the data area 14 can be divided into a plurality of areas for use, the user write area 16 is divided into a plurality of areas according to the number of divisions. Divided area IDa~ID
Identification information for the corresponding unit sector groups 14a to 14d is written in d.

[0007] Identification information includes identification information as to whether the disc is a raw disc or a recorded disc, identification information as to whether the recorded data is a video signal or an audio signal if the disc is a recorded disc, and information as to whether the recorded data is to be erased. This includes availability information, etc. When the identification information to be written is fixed, the location of the information is marked as shown in FIG. 2 (marked locations are shown with diagonal lines).

[0008] Write data in the user write area 16 is read, the information is displayed, and control is performed according to the information. For example, when a video signal is recorded in the sector group IDa and the data can be erased, a mark as shown in FIG. 2 is painted, so the unit sector group 14a
It is recognized that data has been written to the unit sector group 14a, and the next writing of data to the same unit sector group 14a is permitted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a case in which an example of a rewritable disk according to the present invention is applied to a rewritable optical-magnetic disk will be described in detail with reference to the drawings.

FIG. 1 shows an example of this disk 10. In the figure, 12 is a hole into which a rotating shaft for driving a disk is inserted, and 14 is a data area. In this example, a user writing area 16 is provided on the inner circumferential side of the disk 10 and outside the chucking area of the device.

The user writing area 16 is configured as concentric circles having a predetermined width, and various information (identification information) regarding the disc 10 is written here by the user's hand.

Here, if the data area 14 is divided into a plurality of areas and can be used, for example, as shown in the figure, an area divided into four in the circumferential direction (
If it is possible to independently write data to and read data from 14a to 14d (hereinafter referred to as unit sector group), the user write area 16 is divided into multiple units according to the number of divisions. be divided. Identification information for corresponding unit sector groups 14a to 14d is written in divided areas IDa to IDd.

[0013] Identification information includes identification information as to whether the disc is a raw disc or a recorded disc, identification information as to whether the recorded data is a video signal or an audio signal if the disc is a recorded disc, and information as to whether the recorded data is to be erased. This includes availability information, etc. Possible types of identification information other than these include information for determining the front and back sides of the disc, information for determining whether the disc is a single-sided disc or a double-sided disc, and information for determining the disc capacity.

[0014] These identification information are written in the user writing area 16 by the user himself. When the identification information to be written is fixed, the location of the information is marked as shown in FIG. 2 (marked locations are shown with diagonal lines). In the figure, fixed identification information includes identification information (raw/black) indicating whether the disc is a raw disc or a recorded disc, and identification information (raw/black) indicating whether the recorded data is a video signal or an audio signal if it is a recorded disc. V/A), information on whether or not data can be erased (erasability/non-erasability) 3
The figure shows examples of types of identification information.

As shown in FIG. 2, a disc-shaped recording label 18 on which these three types of identification information are printed for each of the divided areas IDa to IDd is used. A start mark 19 is provided on the recording label 18 so that the reading start position can be confirmed. Record label 18
is the same as the user writing area 16, and this is pasted to the user writing area 16. Each time the user uses the corresponding information, the corresponding divided areas IDa to I
It is only necessary to mark the area Dd, and with this operation alone, the areas recorded on the disc 10 and the recorded contents can be visually grasped.

The identification information is further read by an optical reading means and used as a control signal or display signal for the disk device. FIG. 3 shows a system diagram of a disk control circuit showing one example. In the figure, 20 is disk 1
A spindle motor 21 drives the optical head 1, and an optical head 21 is used to write and read data written in the data area 14. A semiconductor laser or the like is used as a light source for the optical head 21.

22 is identification information reading means,
Recording label 18 affixed to user writing area 16
Since the reading means 22 is a mark type, a reflection type detection means (consisting of a photodiode, a phototransistor, etc.) is used as the reading means 22. This reading means 22 is arranged so as to face the user writing area 16. The reading means 22 may also be configured to serve as the optical head 21.

In FIG. 3, the detection signal from the reading means 22 is supplied to the identification information determining means 23, and the recording information of the recording label 18 is determined, such as whether or not data can be written in the designated unit sector group 14a to 14d. It is determined based on. The determination signal is supplied to the mode control circuit 24. The mode control circuit 24 further includes a spindle servo circuit 2.
The disk rotation phase signal obtained from 7 is supplied, and the unit sector group 1 is determined based on this disk rotation phase signal and the discrimination signal.
Mode control is performed for each of areas 4a to 14d. That is, mode control is executed based on a determination signal indicating whether recording is possible in the unit sector groups 14a to 14d and the type of recording data.

Mode switching circuit 2 according to the mode control signal
5 is controlled. The mode switching circuit 25 performs mode switching such as writing (recording), reading (reproduction), and erasing. The auto power control circuit (APC) 26 is controlled according to this selected mode, and the laser output of the semiconductor laser provided in the optical head 21 is controlled.

FIG. 4 shows another example of the disk 10. In this example, the disk 10 is divided into unit sector groups in the radial direction. In this case as well, the user write area 16 is divided into a plurality of sections corresponding to each of the unit sector groups 14a to 14d.

[0021] The above-mentioned identification information is an example. The mark may be a barcode. The barcode is written on that disk 1 in advance.
The one attached to 0 is used.

[0022]

As described above, in the present invention, a user write area is provided in a part of a rewritable disk that does not use a case, and identification information for a unit sector group is written in this area.

[0023] According to this, since the user can record various types of information attached to the disc, it is possible to prevent accidents such as writing data by mistake or erasing data by mistake. have Further, by looking at the contents recorded in the user write area, there is an effect that the data information recorded on the disc can be easily grasped.

Therefore, the present invention is extremely suitable for application to rewritable magnetic disks, optical-magnetic disks, etc. that are used bare without using a case.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of a disk according to the present invention.

FIG. 2 is a configuration diagram showing an example of a recording label.

FIG. 3 is a system diagram of main parts showing an example of a disk control circuit.

FIG. 4 is a plan view showing another example of the disk.

[Explanation of symbols]

10 Disc 12 holes 14 Data area 14a-14d Unit sector group 16 User writing area 18 Record label 21 Optical head 22 Reading means IDa~IDd Divided area

Claims (1)

[Claims] [Claim 1] A user write area is provided in a part of a rewritable disk that does not use a case, and identification information for a unit sector group can be written in the user write area. Rewritable disc.