JPH10334572A - Disk discriminating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively discriminate kinds of individual disks in a disk device into which a magazine housing plural kinds of disks in coexistence is loaded and to prevent driving from causing an adverse effect upon a recording surface of the disk. SOLUTION: ROM disks and RAM disks are housed in coexistence in the magazine, and this magazine is loaded into the disk device. In the disk device, by a detecting part provided on a tray in a step (c), whether this tray is for the ROM disk or the RAM disk is discriminated, and afterward, in a step (d) and downward, shifts of discriminating operation in individual disks are performed. By this method, the individual disks can be discriminated with high accuracy in both ROM disks and RAM disks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PD or DVD-R
Recordable discs such as AM (RAM discs) and read-only discs such as CDs and DVD-ROMs (RO
The present invention relates to a disk discriminating method that can discriminate the type of each disk in a magazine in a disk device using a magazine in which both of them are mixed and stored.

[0002]

2. Description of the Related Art Conventionally, as a disk device in which a plurality of disks are loaded, there is a disk changer of a magazine loading type. However, with conventional disc changers,
A magazine mainly stores a plurality of disks of the same type, such as only a CD or only a DVD in a magazine. However, when the disk device is used as a type of storage device that is a peripheral device of a computer, only the same type of disk, such as a CD or a DVD, can be exchanged, which limits the usage. In view of the above, the present inventor has disclosed in Japanese Patent Application No. 8-252829 that a recordable RAM disk and a read-only ROM disk are housed in the same magazine (package), and the disks in this magazine are selected at any time. Proposes that not only data reading but also data writing can be performed.

[0003]

However, a RAM disk and a ROM disk are mixed in one magazine (package), and the same ROM and the same RA are used.
Even in the case of M-system discs, if discs having different types or discs having different recording formats coexist, it is necessary to identify the type of each disc in the magazine.

[0004] In this case, it is possible to check the recording format while actually reading the signal recorded on the disk after each disk is pulled out of the magazine. There is a limit in efficiently determining the type of each subdivided disk. Also, between the RAM-based disk and the ROM-based disk, if one of the laser beams can be irradiated, but the other is irradiated with the same laser beam,
There are combinations that adversely affect the recording surface, and from that point on,
It is necessary to recognize at least whether the disc is a RAM disc or a ROM disc.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. In a disk device in which a magazine in which a plurality of types of disks are mixed and stored in a magazine is loaded, the type of each disk can be efficiently determined. A disc discriminating method that can discriminate and at least roughly recognizes whether the disc is a RAM disc or a ROM disc in advance, thereby preventing a drive that adversely affects the recording surface of the disc. It is intended to be.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for discriminating a disc in a disc device in which a magazine capable of storing both a recordable disc and a read-only disc is loaded. Discriminating whether an individual disc in the magazine is a recordable disc or a read-only disc, and after the discrimination, pulls out the individual disc from the magazine and records the recording surface of the disc. Discrimination of the type of each disc by at least one of the following methods: detecting the reflectance of the disc, detecting the thickness of the substrate on which the recording surface of the disc is formed, and reading the signal recorded on the disc. It is characterized by the following.

[0007] For example, in a magazine in which a tray on which individual disks are placed is housed so as to be able to be pulled out, whether the individual tray is a recordable disk or a read-only disk. The identification information is added.

[0008] Alternatively, information as to whether the disc stored in the magazine is a recordable disc or a read-only disc is recorded in a storage unit or a recording unit provided in a case of the magazine. There may be.

In the present invention, a RAM disk and a ROM disk can be mixed and stored in a magazine, and a DVD-RAM and a PD (power disk) are mixed as RAM disks, and a ROM disk is mixed. , CDs, DVD-ROMs and the like are used together.

At the time when the magazine is loaded into the disk device, it is possible to recognize in advance whether each disk in the magazine is a RAM system or a ROM system. Type of system disk,
Identification of the type of each ROM-based disk or RAM
The type of each disk in at least one of the system disk and the ROM system disk is determined.

The discrimination as to whether the disc is a RAM disc or a ROM disc can be made, for example, in the case where a plurality of trays are housed in a magazine so as to be able to be pulled out and discs are mounted on individual trays. RAM for each tray
Identification information indicating whether the disk is for a system disk or a ROM disk. This identification information is performed by detecting whether or not a reflection surface is formed on the tray, whether or not an identification protrusion or identification recess is formed on the tray, and the like.

[0012] Alternatively, in a case of a magazine or the like, each of the internal disks is a ROM-based disk or a RAM.
Identification information as to whether or not the disc is a system disc may be stored or recorded. For example, a storage element such as a small-capacity IC memory is attached to a case of a magazine, and based on information extracted from the storage element, it is determined whether each disk is a RAM system or a ROM system. The determination of the detailed type of the disc may be performed.

[0013] Alternatively, a bar code, an identification protrusion of several bits, an identification recess or an identification terminal is provided in a magazine case or the like to record information on whether each disk is a RAM system or a ROM system. May be. Alternatively, identification information as to whether each disk is a RAM system or a ROM system is written in a predetermined area of the RAM system disk in the magazine, and when the magazine is loaded, the disk is always written to the RAM system disk first. The information may be read by accessing.

After determining whether the disk is a RAM disk or a ROM disk, the type of each disk is determined by detecting the reflectance of the recording surface of the disk and forming the recording surface of the disk. Detection of substrate thickness
Reading of a signal recorded on a disc is performed by at least one or more methods. The reading of the signal is performed by reproducing TOC, FAT, and other data recorded on the disc and detecting whether or not demodulation can be performed by a predetermined modulation method. Alternatively, a method is also possible in which the detection light from the optical head is scanned in the radial direction of the disc, and the focus error detection unit detects the track pitch or the like.

[0015] Preferably, the table of contents information (Volume Descripter) recorded in the TOC area of each disk and the table of contents information recorded in the FAT area are compiled into a database together with the disk type information, and are stored in the storage element or a predetermined disk. Will be recorded.

According to the present invention, when a magazine containing a plurality of types of disks is loaded, it is first determined whether each disk is a RAM system or a ROM system.
After that, to move to discriminating the type of each disk,
Disc type can be easily and accurately determined. In addition, problems such as erroneously irradiating the recording surface with laser light are less likely to occur.

[0017]

1 and 2 are flowcharts showing a disk discriminating method according to the present invention, FIG. 3 is a side view showing an example of the configuration of a disk device, and FIG. 4 is a perspective view of a magazine loaded in the disk device. FIG. 5 and FIG. 5 are side views showing an example of a disk discriminating device provided in the disk device. Magazine (or disk package) shown in FIG.
In M, sliding concave portions Mb, Mb are formed on both inner side surfaces of a synthetic resin case Ma, and the sliding concave portions Mb, Mb are formed.
Inside, a plurality of trays T are slidably provided. A hook Ta is formed integrally with the tip of the tray T.
When the disc selecting / driving mechanism 10 in the disc device selects a tray, the drawer member in the disc selecting / driving mechanism 10 is hooked on the hook Ta, and the tray T selected by the drawing member is moved out of the magazine M. Drawn out.

On the upper surface of the tray T, a circular concave portion Tb having a diameter slightly larger than the disk diameter (12 cm) is formed, and the disk D is placed on the concave portion Tb.
At the center of the concave portion Tb, there is provided a notch Tc for exposing the center hole of the disk D downward, and a fan-shaped notch Td for continuously exposing the recording surface of the disk D downward following the notch Tc. Is formed. Magazine M is a read-only R
An OM disc and a recordable RAM disc are mixed and stored.
The tray T on which the AM disk is placed has a protrusion T on the side.
e is provided, and the protrusion Te is locked by a lock mechanism in the magazine M, so that it cannot be pulled out. A small unlocking protrusion Mc is provided on the side of the upper surface of the magazine M, and when the magazine M is loaded into the disk device,
The small protrusion Mc is pushed, and the tray T on which the RAM disk is mounted can be pulled out. Note that the projection Te is not formed on the tray T on which the ROM disk is installed, and the tray T can always be manually pulled out. The tray T on which the RAM disk is installed as described above
Is constructed so as not to be inadvertently withdrawn.
The recording surface of the M-type disc can be protected.

A reflection surface Tf on which a reflection film is formed or adhered is formed on the surface of the projection Te of the tray T on which the RAM disk is installed. A detection window Md is opened on the side of the magazine M, and the tray T is stored in the magazine M, and the reflection surface Tf is connected to the detection window Md.
Appears in Note that the projection Te and the reflection surface Tf are not provided on the tray on which the ROM disk is installed. An IC memory M1 is attached to the bottom of the case of the magazine M as a storage element.

In the disk device shown in FIG. 3, the magazine M is loaded into the housing 1 from the right side in the figure. Case 1
The optical detection device 2 is provided inside the magazine M, which faces the detection window Md of the magazine M shown in FIG. 4, and the optical detection device 2 includes photoreflectors 2a corresponding to the number of trays in the magazine M. When the magazine M is loaded, the individual photoreflectors 2a face the side surfaces of the tray T through the detection windows Md. Therefore, when the tray T dedicated to the RAM disk is provided, the reflection surface Tf is detected, the reflection surface is not detected in the tray T on which the ROM disk is installed, and whether the disk on the tray is a RAM disk. It is possible to detect and identify whether or not it is a ROM system. A contact 3 is provided in the housing 1, and when a magazine M is loaded in the housing 1, a terminal of an IC memory M 1 provided on the bottom of the magazine M contacts the contact 3.
A control unit 4 to which the optical detection device 2 and the contact 3 are connected is provided in the housing 1, and a memory (RAM) 5 for storing data is provided. Further, a control unit 4 in the disk device is connected to a CPU of a host computer by a BUS line 6.

A disk selection / drive mechanism 10 is provided in the housing 1.
Is provided. The disc selecting / driving mechanism 10 moves up and down in the figure to select one of the trays in the magazine M. The drive chassis 11 provided in the disc selection and drive mechanism 10 can swing about the support shaft 12 as a fulcrum, and the swing operation causes the disc on the drawn tray to be clamped. Further, on the drive chassis 11, a turntable 13 which is fitted into a center hole of the disk D to clamp the disk, and the turntable 13
A spindle motor 14 for rotating the optical disk and an optical head 15 are further provided. In the optical head 15, an objective lens having a different numerical aperture is switched according to the type of the disk, or a numerical aperture of the objective lens is switched. Further, the disc selection / drive mechanism 10 is provided with the drawer member for hooking the hook Ta of the tray T and pulling out the tray T, and a drawer drive unit for driving the drawer member.

Further, a disk discriminating device 20 shown in FIG. 5 is mounted on the drive chassis 11 or the optical head 15 of the disk selection / drive mechanism 10. In FIG. 5, a disk clamped on the turntable 13 of the disk selecting / driving mechanism 10 is indicated by a symbol D. Da
Is the surface of the disk. This disk D is, for example, C
In the case of D, CD-R, PD, etc., the thickness of the base material located between the recording surface R1 and the disk surface Da is 1.2 mm. The disk D is a DVD-RAM, DVD-RO
In the case of M or the like, the thickness of the substrate located between the recording surface R2 and the disk surface Da is 0.6 mm. Regardless of the type of disk, the disk surface Da is supported on the same surface on the turntable, so that the heights of the recording surface R1 and the recording surface R2 are different in the disk device.

Although FIG. 5 shows one light source 21 as one light source, in the disc discriminating device 20, the light source 21 is composed of two light sources emitting lights of different wavelengths. The wavelength of light emitted from one light source is 780
The wavelength of light emitted from the other light source is at or near 650 nm, and both light sources are switched and controlled to emit light at different times. Further, the transmission hole 22a opened in the diaphragm means 22 located in front of the light source 21 is, for example, a slit having a predetermined opening width and extending longer than the opening width in a direction orthogonal to the paper surface, or a square or circular hole. is there. The light passing through the transmission hole 22a is applied to the surface of the disk D at an oblique angle.

A light receiving means 23 is provided at a position where the light emitted from the light source 21 and reflected from the recording surface R1 or R2 of the disk D falls.
The light receiving means 23 has two light receiving areas 23a and 23b divided in the inclined direction of the reflected light. The electric circuit configuration to which the light receiving means 23 is connected includes a subtraction means 24a for calculating a difference between a photoelectric conversion output obtained from one light receiving area 23a and a photoelectric conversion output obtained from the other light receiving area 23b, There is provided an adding means 24b for adding the photoelectric conversion outputs obtained from 23a and 23b. Further, a discriminating unit 25 to which the outputs of the subtracting unit 24a and the adding unit 24b are input is provided. The disc discrimination output discriminated by the discriminating means 25 is given to the control unit 4 in the housing 1 of the disc device shown in FIG. Further, the determination unit 25 may be a part of the control unit 4.

Of the luminous fluxes received by the light receiving means 23, reference numerals indicate that the thickness of the substrate is 1.2 mm.
Is a reflected light beam from the recording surface R1 of the disk of
This is a reflected light beam from the recording surface R2 of a disk having a substrate thickness of 0.6 mm. The disc discrimination device 20 can discriminate the difference in the thickness of the base material (1.2 mm and 0.6 mm). In addition to this, it is possible to determine the difference in the reflectance of light on the recording surface R1 or R2.
Alternatively, it is possible to determine the difference in the reflectance of R2 with respect to the light having the wavelength of 780 nm or near and the difference in the reflectance with respect to the light having the wavelength of 650 nm or near.

When a disk having a thickness of 1.2 mm is loaded on the substrate and the light source 21 emits a detection light of any one of the wavelengths, the recording surface positioned 1.2 mm above the disk surface Da. Light is reflected by R1, and the reflected light is received by both the light receiving regions 23a and 23b. When a disk having a substrate thickness of 0.6 mm is loaded and the detection light of the same wavelength as that of 1.2 mm from the light source 21 is applied, the disk is 0.6 mm from the disk surface Da.
Light is reflected by the recording surface R2 located above, and the reflected light is received by both the light receiving region 23a and the light receiving region 23b. The difference in the thickness of the substrate, that is, the disk surface D
a between the reflected light and the reflected light due to the difference in height from the recording surface R1 to the recording surface R1 or R2.
The range corresponding to No. 3 is different. Therefore, between the reflected light and the reflected light, the amount of light received in the light receiving area 23a and the light receiving area 23
The ratio of the amount of received light at b differs.

Therefore, if the difference between the light receiving amount of the light receiving area 23a and the light receiving amount of the light receiving area 23b is obtained by the subtracting means 24a, the discriminating means 25 indicates that the height from the disk surface Da to the recording surface is 1.2 mm. Or 0.6 mm. For example, in the discriminating means 25, the difference between the amount of light received between the light receiving area 23a and the light receiving area 23b when the position of the recording surface is 1.2 mm, and the amount of light received between the light receiving area 23a and the light receiving area 23b when the position is 0.6 mm , And an intermediate value (difference in the amount of received light when the height is 0.9 mm) is set as a threshold value.
By comparing the output obtained from a, the difference in the thickness of the base material can be determined. Further, after the difference in the thickness of the base material is determined, the detection light of 780 nm or the detection light of 650 nm is given from the light source 21, and the reflectance at each wavelength from the recording surface R1 or R2 is given. By detecting the difference, it is possible to discriminate the disc more finely. This reflected light amount can be detected by the output from the adding means 24b for obtaining the sum of the received light amounts of the two light receiving areas 23a and 23b.

Next, a method of discriminating a disk using the disk device loaded with the magazine M will be described with reference to FIG. The magazine M is loaded into the disk drive (step (a)), and Ic on the display screen of the computer is displayed.
On turns on the magazine drive software. Immediately after this activation, the IC memory M1 at the bottom of the magazine M is accessed via the contact 3 shown in FIG. When the magazine M is in the initial state and the database is not stored in the IC memory M1, the display indicates that the magazine is in the initial state, and whether or not to proceed to the discriminating operation of the disks in the magazine M is performed. Is displayed (step (b)). When the mark is set to "YES" and an input button (for example, a mouse click button) is pressed with respect to this display,
The process proceeds to a disc determination operation. The following disk discriminating operation is executed by the processing of the control unit 4 provided in the disk device. Alternatively, each detection output may be sent to the CPU of the host computer through the BUS line 6, and the CPU may execute the following disc determination operation.

Step (c) in this disc discriminating operation
Then, the output from the optical detection device 2 shown in FIG. When the tray T dedicated to the RAM disk is stored in the magazine M, the reflection surface Tf formed on the side surface of the tray T appears on the detection window Md on the side surface of the magazine M as shown in FIG. The reflected light of the light emitted by itself is detected. At this point, it is possible to know which of the plurality of trays is a dedicated tray for the RAM disk and which is a dedicated tray for the ROM disk. After the information detected by the optical detection device 2 is provided to the control unit 4, the control operation of the control unit 4 starts the disk selection / drive mechanism 10 to select a disk in the magazine M. . Then, the trays are sequentially pulled out one by one onto the disc selection / drive mechanism 10.

When the reflection surface Tf of the tray T is detected by the optical detection device 2, it is determined that a RAM disk is set on the tray T. However, PD (power disk) is used as a RAM disk
And a DVD-RAM (digital versatile disk-RAM). In this case, R
Pull out the tray for the AM type disc, load the disc on the turntable 13, read the data recorded on the disc with the optical head 15, change the recording format to PD
Or a DVD-RAM. The optical head 15 can switch the objective lens or the numerical aperture of the objective lens. When the optical detection device 2 determines that the optical head 15 is a tray on which a RAM disk is placed, The data is read by switching the objective lens in the optical head 15 to an objective lens suitable for PD and DVD-RAM or by changing the numerical aperture of the objective lens.

If the reflection surface Tf of the tray T is not detected by the output from the optical detection device 2 in the step (c), it is determined that the tray T is dedicated to the ROM disc. By the disk selection / drive mechanism 10, the above R
When the tray T dedicated to the OM disc is pulled out and the disc D is loaded on the turntable 13, the detection light is applied obliquely from the light source 21 of the disc discriminating device 20 shown in FIG. The difference in the amount of received light between the light receiving regions 23a and 23b differs depending on whether the reflected light is as shown in FIG. In the determination means 25, the subtraction output from the subtraction means 24a is compared with a threshold value corresponding to a detection output when the substrate is equivalent to 0.9 mm. When the thickness of the disk base material obtained by the subtraction output is 0.9,
If it is smaller than mm, the disc placed on the tray T is determined to be a DVD.

Here, the projection T in the magazine M shown in FIG.
The tray T having the letter e is dedicated to the RAM disk. As described above, the protrusion Te is locked by the lock mechanism in the magazine M, so that the tray cannot be manually pulled out. However, the protrusion Te that appears in the detection window Md of the magazine M is pushed in with a tool such as a screwdriver, and the protrusion T
If e is broken or deformed, the tray can be pulled out of the magazine M even if the tray is dedicated to the RAM disk.
In this system, when the tray T is pulled out by breaking or deforming the protrusion Te for some reason, the recording surface of the DVD-RAM may be stained thereafter and the writing accuracy may be reduced. DVD on Tray T
-Even if a RAM is mounted, after the protrusion Te is destroyed, this DVD-RAM is used as a ROM that does not perform recording. When the protrusion Te is broken or deformed, the optical detection device 2 cannot detect the reflection surface Tf.

Therefore, in step (c) of FIG. 1, the reflection surface Tf is not detected, and it is determined that the tray is dedicated to a ROM-based disk. In step (d), the thickness of the disk base material is 0.9 mm. If it is determined that the disc is smaller (0.6 mm), the disc on the tray T is
There may be a case of a ROM and a case of a DVD-RAM treated as a ROM. Therefore, in this case, in step (e), the light source 21 shown in FIG. 5 emits detection light having a wavelength of 780 nm, and the reflectance is checked based on the detection output of the adding means 24b. If the reflectance is greater than 50%, the disc on this tray is determined to be a DVD-ROM, and if the reflectance is less than 50%, the DVD is treated as a ROM.
-Determine that it is a RAM.

Next, when it is determined in step (d) that the thickness of the disk base material is larger than 0.9 mm and 1.2 mm, in step (f), the light source 21 shown in FIG. Irradiation is performed with detection light having a wavelength of 780 nm, and the reflectance is detected based on the addition output from the addition means 24b. When it is determined that the reflectance exceeds 50%, the light of the light source 21 is switched in step (g) to change the wavelength
A detection light of 50 nm is given to the disk. If the reflectance at this time exceeds 50%, it is determined that the disk placed on the tray dedicated to the ROM disk is a CD. However, when the reflectance with respect to the detection light having a wavelength of 650 nm is lower than 50% in step (g), R
It is determined that the CD-R is erroneously set in the tray dedicated to the OM disc, an error message is displayed on the disc display of the host computer, and the tray on which the disc is placed is forcibly returned to the magazine M. .

If the thickness of the disk base material cannot be detected in step (d), it is determined that the disk is not set on the tray, and an error message is displayed on the display. In step (f),
When it is determined that the reflectance with respect to the detection light having a wavelength of 780 nm is smaller than 50%, it is determined that a disk not intended to be used is mounted, an error message is displayed in the same manner, and the tray is set in the magazine M. Force return inside.

As described above, immediately after the discrimination means 25 discriminates the type of the disc set in each tray T in the magazine M, information is read from the optical disc for each disc. And in the case of PD, FA
Read T (step (h)), DVD-RAM, D
In the case of a VD-ROM, a DVD-RAM, or a CD treated as a ROM, TOC information is read (step (i)), and a Volume Descripter is read as table of contents information (step (j)).

As described above, all the trays T in the magazine M are pulled out to determine the type of each disk and to read the table of contents information. Is written into the memory 5 in the disk device shown in FIG. Then, all trays are pulled out, and step (m)
After the type information and the table of contents information are written in the memory 5 and made into a database at step (k),
The contents recorded in the memory 5 are stored in the I
The data is transferred and written to the C memory M1. In this writing operation, only the disc type information may be transferred to the IC memory M1.

In step (m), after the data is recorded in the memory M1 of the disk device, the data is sent to the host computer through the BUS line 6, and the icon indicating the identification of each disk is displayed on the display. When the icon of any one of the discs is selected and the operation button (mouse click button) is pressed, the table of contents information (FAT information or Vo
lume Descripter) is displayed. When the icon corresponding to one of the disks is selected, the magazine M
The tray of the disc selected from among the trays is pulled out, the related software is started, and the state of reading or recording information from the disc is enabled. In the step (k), the disc type information and the table of contents information are recorded in the IC memory M1 of the magazine M after being made into a database, but the magazine M does not have the IC memory M1. In step (k), a predetermined writable disc, for example, a tray T on which a DVD-RAM is installed is pulled out, and disc type information and table of contents information are recorded in a predetermined recording area of the disc.

As described above, the magazine M in which the type information and the table of contents have been written to the IC memory M1 (or a predetermined disk) is taken out of the disk device, and when the magazine is reloaded into the disk device, the step (b) is performed. In step (n), the control unit 4 accesses the IC memory M1 and determines that there is write information in the IC memory.
In, the data recorded in the IC memory M1 is read into the memory 5 in the disk device. Then, the information can be accessed from the CPU of the computer, the icon concerning the type of each disc is displayed on the display, the table of contents information can be displayed, and the reproducing operation and the recording operation for each disk can be performed immediately. If the magazine M is not provided with the IC memory M1 and the type information and the table of contents information are recorded on any one of the disks, in step (b), the recorded disk is reproduced. The identification information and the table of contents information recorded therein are read out and stored in the memory 5.

FIG. 2 is a flowchart showing another processing method. In FIG. 2, the ID code of the magazine is recorded in the small-capacity IC memory M1 installed on the bottom of the case of the magazine M, or in a bar code or other identification recording means attached to the case instead of the IC memory. Each magazine has a different code number. In step (s) shown in FIG. 2, the ID code of the loaded magazine M is read, and in step (o), it is determined whether a database corresponding to the ID code is stored in the memory 5. When the database is not stored, the discrimination between the tray for the RAM disc and the tray for the ROM disc and the discriminating operation of each disc are performed in step (c) and thereafter. After discrimination of the type of each disk and reading of the table of contents information, the identification information of each disk and the table of contents information such as TOC are stored in a database in step (p) together with the magazine identification code (ID code). This database is stored in the memory 5 at (q).

When the magazine M, which has completed the disk discrimination operation and the storage of the database, is reloaded into the disk device, the memory 5 is accessed in step (o) of FIG. 2 to correspond to the ID code of the magazine. It is confirmed that the database is stored. In this case, the determination operation after step (c) is not performed, and
The database stored in the memory 5 is read and stored in the host computer, and can be driven according to the type of each disk.

In the example shown in FIG. 1, the IC memory M1
In FIG. 2, all identification information of each disk is stored.
An ID code for identifying a magazine is stored in the IC memory M1 or the like.
In the memory, only identification information of whether each disk is a ROM system or a RAM system is stored, or an IC memory M
In accordance with the ID code for identifying the magazine recorded in No. 1, the disc in the magazine is ROM-based or
Only the information on whether the system is the M system may be stored in the memory 5. In this case, in step (c) of FIGS. 1 and 2, which of the disks in the magazine is the ROM system and which is the RAM system based on the storage contents of the IC memory M1 or the storage contents of the memory 5 Is determined, and thereafter the type of each disk is determined in step (d) and subsequent steps.

[0043]

As described above, according to the present invention, in a disk device in which a magazine in which a ROM-based disk and a RAM-based disk are mixed and loaded is loaded, when the magazine is loaded, the ROM-based disk is first used. After discriminating whether the disc is a RAM disc or a RAM disc, the operation shifts to the discriminating operation of individual discs, so that the disc type can be discriminated with high accuracy. In addition, the problem that the recording surface of the disk is erroneously irradiated with laser light does not occur.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a disc identification method according to a first embodiment of the present invention;

FIG. 2 is a flowchart showing a disc discriminating method according to a second embodiment of the present invention;

FIG. 3 is a side view of the disk drive,

FIG. 4 is an exploded perspective view of a disk magazine.

FIG. 5 is a side view showing an example of a disc discriminating device.

[Explanation of symbols]

 D Disk M Magazine M1 IC memory T Tray Tf Reflection surface 1 Disk device housing 2 Optical detector 2a Photoreflector 3 Contact for IC memory 4 Control unit 5 Memory 6 BUS line 10 Disk selection / drive mechanism 13 Turntable 15 Light head

Claims (3)

[Claims] 1. A disc discriminating method for a disc apparatus in which a magazine capable of storing both a recordable disc and a read-only disc is loaded, wherein information stored in the loaded magazine is used to determine whether each disc in the magazine is loaded. Discriminating whether the disc is a recordable disc or a read-only disc, and after the discrimination, pull out each disc from the magazine, detect the reflectance of the recording surface of the disc, and Detection of the thickness of the substrate on which the recording surface is formed, reading of signals recorded on the disc,
Discriminating the type of each disc by at least one or more methods. 2. A magazine in which trays on which individual disks are placed are housed in such a manner that the trays can be pulled out, and the individual trays have identification information indicating whether they are recordable disks or read-only disks. 2. The disc discriminating method according to claim 1, further comprising: 3. A storage unit or a recording unit provided in a case of a magazine, wherein information as to whether the disk stored in the magazine is a recordable disk or a read-only disk is recorded. 1. The disc discriminating method according to 1.