WO2002095750A1

WO2002095750A1 - Disc drive and disc drive method

Info

Publication number: WO2002095750A1
Application number: PCT/JP2002/004807
Authority: WO
Inventors: Kazuhito Narita; Satoshi Tsuchiya; Shingo Takabayashi
Original assignee: Sony Corporation
Priority date: 2001-05-21
Filing date: 2002-05-17
Publication date: 2002-11-28
Also published as: JP2002352557A

Abstract

A disc drive for reading out data management information from a disc-shaped recording medium and storing the information in a storage block comprises a signal processing block (12) for recording and reproducing data and management information corresponding to the data onto/from a disc-shaped recording medium (26), a first storage block (25) connected to the signal processing block (12), and a second storage block (19) connected to the signal processing block (12) and retaining the recorded state even when power supply from a main power source stops.

Description

TECHNICAL FIELD The present invention relates to a disk drive and a disk driving method for reading management information of data recorded on a disk-shaped recording medium and storing the information in a storage unit. Medium Disk drive and disk that store the management information of the recorded data in the storage unit and read out the management information from the storage unit when the power supply from the main power supply is cut off and the main power supply is supplied again. It relates to a driving method. BACKGROUND ART Sony Corporation and Philips Corporation announced CD-ROM (CD Read Only Memory) in 1983, following CD-DA (Compact Disc Audio) in 1985. A CD-ROM is a non-contact recording medium that optically reads data by a reading device having a light source that emits a light beam. Therefore, there is an advantage that there is no abrasion or damage during data reproduction. Therefore, in a device for reproducing a CD-ROM, for example, an error such as a head crash which occurs in a device for reproducing a contact-type recording medium such as a magnetic tape does not occur. Thus, a CD-ROM is an optical recording medium that is superior to a contact-type recording medium. CD-ROMs have a recording capacity of approximately 640 MB and are a recording medium that can handle large data.

Here, Red Book, a CD-DA standard, is described. The Red Book stipulates that the optical disc is composed of segments called “Lesd In information”, “Program Area”, and “Lead Out information”. The process from the lead-in information to the read-out information is referred to as a session in Yellow Book, which is a CD-ROM standard. The program area contains computer data and digital audio data on the optical disc. Data (hereinafter referred to as data) is actually included. The Red Book specifies that this data can be split into up to 99 tracks, with a gap of about 2 seconds between each track. The lead-in includes TOC (Table Of Contents) which is track index information.

All CD specifications specify that data be placed on disks in units called sectors. The size of one sector is 2 3 5 2 by t e s. One sector includes a data area of 2048 bytes, a sector header, a subheader, an error detection code, and the like. Although the data area is treated as a logical block, it is usually treated as a user area of 204 Bytes. Within each session, each logical block has a set of logical addresses. A device that reproduces data from an optical disk accesses each sector using this logical block number (LBN, Logical Block Number;).

In recent years, CD_R (CD Recordable), a medium on which data can be recorded, and CD-RW (CD Rewritable), a rewritable medium, have appeared. The CD-R is an optical recording medium in which the recording layer is formed of an organic photoreactive dye film, and data is recorded by irradiating the recording layer with a laser beam for recording. CD-R is an optical recording medium in which data is sequentially recorded from the inner circumference to the outer circumference, and new data can be added after the recorded data as long as the recording capacity permits. Also, since the CD-R is a write-once (Write Once) method that does not allow overwriting, physical data is recorded by so-called multi-session additional recording, in which a track is divided into multiple sessions. In CD-RW, for example, the recording layer is formed of a phase change material such as Ag-In-Sb-Te, and the recording layer is irradiated with a recording laser beam to record data. Is performed on the optical recording medium. Specifically, data of 00- ^ is recorded by a phase change reaction which is a physical transition between crystalline and non-crystalline.

In an optical recording medium such as a CD-ROM, data is continuously and spirally recorded from the inside to the outside of the medium. Such a recording method is called a sequential write method. Sequential writing methods include Dλθ (Disc At Once), TAO (Track At Once), and packet light. DAO is for one medium This is a recording method that records all data at once, and it is not possible to add data later. TAO is a recording method in which data is recorded in track units, and data can be added later. A packet light is a recording method that allows data to be recorded in smaller units than a TAO track, and allows data to be added later. TAO can record only up to 99 tracks according to the rules of the Red Book described above. However, packet writing is an easy-to-use recording method with no limitation on the number of packets. The sequential write method described above is, for example, a recording method for recording data on a CD-R. .

Further, there is a recording method called a random write method in which data is discretely recorded on the entire optical recording medium. The random write method is a recording method that enables writing and erasing of data for each packet. Unlike the recording of data by the sequential write method, the recording of data by the random write method has an advantage that a recording software used for recording data, so-called writing software, is not required. Generally, when data is recorded on CD-RW, a random write method is adopted, but a sequential write method may be adopted.

A data recording / reproducing apparatus that records data on an optical recording medium and reproduces and deletes the recorded data has a task of reading management information from the optical recording medium immediately after power is supplied from a main power supply. Do. It takes a lot of time to read this management information from the optical recording medium. Therefore, the data recording / reproducing device takes the read management information into RAM. When reading data from an optical recording medium, the data recording / reproducing measure reads management information from the RAM and reads data from the optical recording medium based on the read management information. Further, when recording new data on the optical recording medium, the data recording / reproducing apparatus records management information generated according to the new data on the optical recording medium and the RAM. Therefore, the management information recorded on the optical recording medium matches the management information recorded on the RAM.

As described above, when power is supplied from the main power supply, the data recording / reproducing device reads management information from the optical recording medium, and after completing the operation of recording the read management information in the RAM, recording data. Work such as reproduction and erasure becomes possible.

By the way, the management information recorded in RAM is cut off from the main power supply. If the power is supplied again from the main power supply, the data recording / reproducing apparatus E must read the management information from the optical recording medium again and store the read management information in the RAM. Must. For this reason, it is desirable to maintain the power supply from the main power supply to the data recording / reproducing device when recording, reproducing and erasing a series of data.

In recent years, when the data recording / reproducing apparatus has not been operated for a certain period of time for the purpose of reducing power consumption, the power supply of the data recording / reproducing apparatus may be cut off. In conventional data recording / reproducing devices, when power supply is cut off and power is supplied again, operations such as data recording, reproduction, and erasure are performed to read management information from the optical recording medium. There is a problem that it takes a lot of time until it becomes possible. DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above situation, and has a disk drive and a disk drive that can be started at a high speed even if power supply is cut off and power is supplied again. It is an object to provide a disk drive method. .

In order to achieve the above object, a disk drive according to the present invention includes a signal processing unit that records and reproduces data and management information corresponding to data on a disk-shaped recording medium, and a first processing unit that is connected to the signal processing unit. And a second storage unit, which is connected to the signal processing unit and retains the recording state even when the power supply from the main power supply is interrupted. The signal processing unit temporarily stores data recorded on the disc-shaped recording medium and / or data recorded on the disc-shaped recording medium in the second storage unit when power is supplied from the main power supply. At the same time, the data management information is stored in the first storage unit, and when the power supply from the main power supply is cut off, the latest management information stored in the first storage unit is written to the second storage unit. When the power is supplied again from the main power supply, the latest management information is read from the second storage unit.

When power is supplied from the main power supply, this disk drive reads management information from the disk-shaped recording medium, stores the read management information in the first storage unit, and shuts off power supply from the main power supply. The management information stored in the first storage unit Is stored in the second storage unit that retains the storage state even when the power supply from the main power supply is cut off, and when the power supply is performed again from the main power supply, the management information is stored from the second storage unit. read out.

In the disk drive method according to the present invention, when power is supplied from a main power supply, management information is read from a disk-shaped recording medium in which data and management information corresponding to the data are recorded, and the read management information is read. Stores the management information stored in the first storage unit when the power supply is cut off from the main power supply when it is stored in the first storage unit. Then, when power is supplied again from the main power supply, the management information is read from the second storage unit.

In the disk drive method according to the present invention, when power is supplied from a main power supply, management information is read from a disk-shaped recording medium, the read management information is stored in a first storage unit, and power is supplied from the main power supply. When the supply of power is cut off, the management information stored in the first storage unit is stored in the second storage unit, which retains the storage state even when the supply of power from the main power supply is cut off, and When power is supplied from the power supply, management information is read from the second storage unit.

Further objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of the embodiments described below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an electronic camera to which the present invention is applied.

FIG. 2 is a diagram illustrating an operation of a storage unit provided in an electronic camera to which the present invention is applied. FIG. 3 is a diagram showing a data area of an optical disc on which data is recorded by an electronic camera to which the present invention is applied. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which the present invention is applied to an electronic camera (DSC, Digital Still Camera) will be described. As shown in FIG. 1, an electronic camera 1 to which the present invention is applied includes an optical pickup unit (0P: Optical Pickup) 10, an RFIC 11, and a signal processing unit (DSP: Digital Signal Processor) 12. , Spindle motor 13, thread motor 14, spindle driver 15, thread driver 16, focus driver 17, tracking driver 18, storage unit 19, back-up The optical disk 26 includes a power supply unit 20, a CPU (Central Processing Unit) 21, a flash ROM 22, an EEPROM (Electrically Erasable Programmable Read Only Memory) 23, a camera unit 24, and a RAM 25. It records, reproduces, and deletes data from

The signal processing unit 12, the CPU 21, the flash ROM 22, and the camera system unit 24 mutually transmit and / or receive signals via the bus A as shown in FIG. The RFIC 11 and the camera system section 24 mutually transmit and / or receive signals via the bus B. Bus A is the main bus, and bus B is a serial bus.

The optical pickup unit 10 is connected to the RF IC 11, the signal processing unit 12, the focus driver 17, and the tracking driver 18. The optical pickup unit 10 includes an objective lens, a laser diode, a laser diode driver (LD Driver), a photodetector IC (PDIC), a half mirror, and the like. Supply 1 Also, when recording data on the optical disk 26, the optical pickup unit 10 transmits a laser flash signal and a driving signal necessary for forming a pit, a light strategy signal indicating the laser intensity and an optimal value of blinking, and the like. It is supplied by the signal processing unit 12. The optical pickup unit 10 is controlled by a focus driver 17 and a tracking driver 18.

The RF IC 11 is connected to the signal processing unit and the camera system unit 24. The RFIC 11 performs arithmetic processing such as sampling and holding on the eight signals consisting of the beam signal, the side, and the main detected from the optical pickup unit 10, and performs a predetermined processing among the eight signals. From signal to focus error (FE, Focus Error) signal, tracking error (TE, Tracking Error) signal, mirror (MIRR, Mirror) signal, AT IP (Absolute Time In Pregroove) signal, readout main signal, etc. Generate a signal. The RFIC 11 supplies the FMDT (Frequency Modulation Data) signal, the FMCK (Frequency Modulation Clock) signal, the FE signal, and the TE signal to the signal processing unit 12 among the generated signals, and outputs the laser intensity detected by trial writing. Supply the optimal value (0PC, Optical PowerCalibration) signal and laser blinking 'drive signal to the signal processor 12.

The signal processing unit 12 is connected to the storage unit 19, the spindle driver 15, the thread driver 16, the focus driver 17 and the tracking driver 18, and is controlled by the CPU 21. Have been. The signal processing unit 12 receives the FMDT signal, the FMCK signal, the TE signal, and the FE signal from the RFIC 11 and generates a servo control signal controlled by the CPU 21 to control various servos. The signal processing unit 12 generates an analog signal from the generated servo control signal, and supplies the analog signal to the spindle driver 15, the thread driver 16, the focus driver 17, and the tracking driver 18.

The signal processing unit 12 is supplied with the optical pickup C from the RFIC 11, and performs processing such as CIRC (Cross Interleaved Reed-Solomon Code) decoding and encoding, light strategy, and ADD r decoding. When data is recorded on the optical disk 26, the signal processing unit 12 supplies the optical pickup unit 10 with a laser blinking / driving signal and a signal indicating the optimum value of the laser intensity.

The spindle motor 13 rotates the optical disk 26 based on a signal supplied from the spindle driver 15. The thread motor 14 performs a thread operation of the optical pickup unit 10 based on a signal supplied from the thread driver 16. The spindle dryer 15 is connected to the spindle motor 13 and controls the rotation of the spindle motor 13 based on a signal supplied from the signal processing unit 12. The thread driver 16 is connected to the thread motor 14 and controls a thread operation of the thread motor 14 based on a signal supplied from the signal processing unit 12. The focus driver 17 moves the optical pickup unit 10 in the vertical direction with respect to the optical disk 26 based on the signal supplied from the signal processing unit 12, and controls the focus position of the beam. The tracking driver 18 oscillates the optical pickup unit 10 based on a signal supplied from the signal processing unit 12 and irradiates the optical disk 26 with a beam. Control the position of the spot.

The storage unit 19 is, for example, an SRAM (Static Random Access Memory). The storage unit 19 is connected to the backup power supply unit 20 and retains the storage state even when the power supply from the main power supply is cut off. The backup power supply unit 20 supplies a backup power supply to the storage unit 19 when the supply of power from the main power supply is cut off. Here, the operation of the storage unit 19 will be described with reference to FIG. When the power supply from the main power supply is cut off, the storage unit 19 operates as a backup memory for storing management information of the optical disk 26. On the other hand, when power is supplied from the main power supply, the storage unit 19 operates as a buffer memory that stores various processing signals of the RFIC 11 and the signal processing unit 12.

The CPU 21 controls the signal processing unit 12 and the image signal calculation processing unit 18 via the bus A. The flash ROM 22 stores a program for processing data recorded on the optical disk 26. The EPROM 23 stores adjustment data for the optical pickup unit 10 and the like.

The camera system unit 24 includes a not-illustrated photographing unit, an image signal calculation processing unit, and the like. The imaging unit includes a lens unit that captures the subject, a CCD, an S / H circuit unit, and an A / D converter. The CCD generates an image signal from the image of the subject supplied from the lens unit, and supplies the generated image signal to the SZH circuit unit. The SZH circuit performs arithmetic processing such as sampling and holding on the image signal, and supplies the image signal to the A / D converter. The AZD converter converts the image signal into a digital image signal and supplies the digital image signal to an image signal operation processing unit. The image signal arithmetic processing unit performs image processing such as color standard form conversion from RGB signals to color difference / luminance signals, white balance, gamma correction, and reduced image processing on the digital image signal supplied from the imaging unit. . The processed digital image signal is supplied to a monitor and displayed.

The RAM 25 is a volatile memory that stores management information of the optical disk 26. The optical disk 2.6 is a rewritable recording medium such as a CD-RW on which data is recorded, reproduced, erased and additionally recorded. On the optical disc 26, as shown in FIG. 3, a PMA (Program Management Area), a lead-in information area, a program area, and a read-out information area are sessionized in a data area. ' Here, the operation of the electronic camera 1 when the power supply from the main power supply is cut off will be described.

The electronic camera 1 may employ a sequential write method in which data is continuously and spirally recorded from the inside of the data area of the optical disc 26 to the outside, or the optical disc 26 may be used. Alternatively, a random write method of discretely recording data in the data area may be adopted. When the electronic camera 1 records data on the optical disk 26 by using, for example, the sequential write method, the electronic camera 1 starts recording data from a predetermined location in the program area of the optical disk 26, and uses the index information of the data as described above. Record a certain TOC (Table Of Contents) in the PMA. At this time, the TOC recorded on the PMA is a provisional TOC, and when the optical disc 26 is subjected to the finalizing process, the provisional TOC is written as an official TOC in the redin information area.

Here, the finalizing process will be described. Optical disc data recorded in UDF file format cannot be played back on a general personal computer (PC). This is because PC does not support the UDF file format. Therefore, in order to be able to play an optical disk in a UDF file format on a PC, it is necessary to convert the file format of the optical disc to a finale format supported by the PC. This conversion work is called finalization processing.

As described above, the electronic camera 1 reads the TOC from the optical disk 26 when the optical disk 26 on which data is recorded is installed and power is supplied from the main power supply, and the read TOC is read. A storage operation for storing the data in the RAM 25 via the signal processing unit 12 is performed. When this storage operation is completed, the electronic camera 1 becomes capable of recording, reproducing and erasing data. The electronic camera 1 periodically compares the TOC recorded on the optical disk 26 with the TOC stored on the RAM 25, and if the TOC is different, the TOC on the optical disk 26 is compared with the RAM 25. To store and update. In this way, the TOC recorded on the optical disc 26 and the TOC stored in the RAM 25 always match.

The electronic camera 1 uses the RAM 2 when performing operations such as recording, reproducing, and erasing data. Use the TOC stored in 5. The electronic camera 1 stores the TOC generated when new data is recorded on the optical disk 26 in the RAM 25 and records the TOC on the optical disk 26.

When the electronic camera 1 is not used for a certain period of time, the power supply from the main power supply is cut off, and when the electronic camera 1 is used again, the power supply from the main power supply is performed. By doing so, the power consumption of the main power supply is reduced. The electronic camera 1 stores the latest TOC stored in the RAM 25 in the storage unit 19 when the power supply from the main power supply is cut off. At this time, the various processing signals of the RFIC 11 and the signal processing unit 12 stored in the storage unit 19 are deleted. The backup power supply unit 20 supplies power to the storage unit 19 instead of the main power supply when the supply of power from the main power supply is cut off.

When power is again supplied from the main power supply, the electronic camera 1 uses the TOC stored in the storage unit 19 to perform operations such as recording, reproducing, and erasing data on the optical disk 26. Do. That is, the electronic camera 1 does not perform the operation of reading the TOC from the optical disk 26 again at the time of restart. The electronic camera 1 may be set so that the power supply from the main power supply is automatically cut off when the electronic camera 1 is not operated for a certain period of time or may be performed manually.

When the power is supplied from the main power supply, the electronic camera 1 configured as described above reads the management information recorded on the optical disk 26, stores the read management information in the RAM 25, and When the power supply is cut off from the power supply, the management information stored in the RAM 25 is stored in the storage unit 19, the power is supplied to the storage unit 19 by the backup power supply unit 20, and the main power supply is turned on again. When the power is supplied from the storage unit, data recording, reproduction, and erasing are performed by using the management information stored in the storage unit 19. Therefore, the electronic camera 1 to which the present invention is applied can be started at a high speed when restarting. Industrial Applicability As described above, the disk drive according to the present invention is supplied with power from the main power supply. In this case, the latest management information is read from the disk-shaped recording medium by the signal processing means, and the read latest management information is stored in the first storage unit. The management information stored in the first storage unit is written to the second storage unit that retains the storage state even when the power supply from the main power supply is cut off, and when the power supply is performed again from the main power supply, The management information is read from the second storage unit. Therefore, the disk drive according to the present invention does not need to read the management information from the disk-shaped recording medium again at the time of restarting, and thus can start up at high speed.

In the disk drive method according to the present invention, when power is supplied from a main power supply, the latest management information is read from the disk-shaped recording medium, the read latest management information is stored in a first storage unit, When the supply of power is cut off, the management information stored in the first storage unit is written to the second storage unit, which retains the storage state even when the supply of power from the main power supply is cut off, and the main When the power is supplied from the power supply, the management information is read from the second storage unit. Therefore, the disk drive method according to the present invention does not perform the operation of reading the management information from the disk-shaped recording medium again at the time of restart, thereby enabling high-speed startup. .

Claims

The scope of the claims

1. Signal processing means for recording and reproducing data and management information corresponding to the data on a disk-shaped recording medium;

A first storage unit connected to the signal processing means,

A second storage unit that is connected to the signal processing unit and retains a recording state even when power supply from the main power supply is interrupted;

The signal processing means, when power is supplied from a main power supply, stores the data recorded on the disk-shaped recording medium and / or the data recorded on the disk-shaped recording medium in the second storage unit. And temporarily stores the data management information in the first storage unit, and when the power supply from the main power supply is cut off, the latest stored in the first storage unit. A disk drive which writes management information into the second storage unit and reads out the latest management information from the second storage unit when power is supplied again from the main power supply. . ■

2. Every time new management information is recorded on the disc-shaped recording medium in accordance with the recording of new data, the signal processing means updates the management information stored in the first storage unit. The disk drive according to claim 1, wherein:

3. The disk drive according to claim 1, wherein said signal processing means reads management information including TOC (Table Of Contents) corresponding to the data.

4. When the power supply from the main power supply is cut off, the management information stored in the first storage unit is transferred to the SRAM (Static Random Access Memory) which is the second storage unit. 2. The disk drive according to claim 1, wherein the disk drive is incorporated in a disk drive.

5. When the power supply from the main power supply is cut off, the latest management information written in the second storage unit is retained even after the power supply from the main power supply is cut off. 2. The disk drive according to claim 1, further comprising backup power supply means for supplying power to said storage section.

6. The disk drive according to claim 1, wherein the disk-shaped recording medium is a write-once or rewritable disk.

7. The disk drive according to claim 1, wherein said disk drive further comprises a video camera including an image sensor.

8. When power is supplied from the main power supply, the management information is read from the disk-shaped recording medium on which the data and the management information corresponding to the data are recorded,

The read management information is stored in the first storage unit,

When the power supply from the main power supply is cut off, the management information stored in the first storage unit is stored in the first storage unit. ,

A disk drive method comprising reading management information from the second storage unit when power is supplied again from a main power supply.

9. When the power supply from the main power supply is cut off, the latest management information written in the second storage unit is retained even after the power supply from the main power supply is cut off. 9. The disk drive method according to claim 8, wherein power is supplied to the storage unit by a backup power supply unit.

10. The disk drive method according to claim 8, wherein the disk-shaped recording medium is a write-once or rewritable disk.