EP0357464A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information recording and reproducing apparatus using optical discs
Assignee: Panasonic Holdings Corp
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Filing: 1989-09-04
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Granted: —
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Expires: 2009-09-04
Abstract
Abstract An information recording and reproducing apparatus having a plurality of optical disk drives including a data optical disk drive for storing data, a work optical disk drive for temporarily storing the data and, preferably, a disk cache memory. The optical disk drives are coupled to a host device through an optical disk control unit for controlling recording and reproduction of the data thereon and therefrom. The optical disk control unit once writes commands and data transmitted from the host device into the work optical disk drive and the disk cache memory and, if required, writes the data of the disk cache memory into the data optical disk drive. The optical disk control unit, on rising of the apparatus, restores the data of the data optical disk drive to be in the latest state by using the contents of the work optical disk drive, whereby the number of times of writing to an optical disk is decreased with the disk cache memory so as to prevent the data loss on occurrence of abnormality of the apparatus.
Inventors
- 👤 Isao Satoh
- 👤 Yoshihisa Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 08:44
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/002; G11B7/0037; G06; G06F; G06F11/00; G06F11/07; G06F11/14; G06F12/00; G06F12/02; G06F12/08; G06F12/0802; G06F12/0804; G06F12/0866
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
An information recording and reproducing apparatus comprising; a data storage device (6) for storing data, a work data storage device (7) for temporarily storing the data, and a storage device control unit (4) for coupling said data storage device (6) and said work data storage device (7) to a host device to control recording and reproduction of the data, said storage device control being adapted to, in use, write data-update control commands and recording data issued by said host device to said work data storage device and also further write said recording data to said storage device in accordance with said control commands so that, in response to the occurrence of an error or fault in said data storage device, the state of said data storage device can be restored using the control commands and recording data read from the work data storage device.
Claim 2
Dependent Claim
144 words
An information recording and reproducing apparatus comprising; a data storage device (6) for storing data, a work data storage device (7) for temporarily storing the data, and a storage device control unit (4) for coupling said data storage device (6) and said work data storage device (7) to a host device to control recording and reproduction of the data, said storage device control being adapted to, in use, write data-update control commands and recording data issued by said host device to said work data storage device and also further write said recording data to said storage device in accordance with said control commands so that, in response to the occurrence of an error or fault in said data storage device, the state of said data storage device can be restored using the control commands and recording data read from the work data storage device.
Claim 3
Dependent Claim
72 words
An apparatus according to claim 1, further comprising a cache memory (5) for temporarily storing the data, and wherein said optical disk control unit further controls said cache memory and said storage devices so as to first write said recording data said to work data storage device and simultaneously said cache memory and said recording data from said cache memory to said data optical disk drive in accordance with a write-back system.
Claim 4
Independent Claim
25 words
An apparatus according to claim l or 2, wherein said recording data and said control commands are recorded in time order as a sequential file.
Claim 5
Dependent Claim
141 words
An information recording and reproducing apparatus comprising a data storage device (6, 7) for recording and reproducing data, a cache memory (5) for temporarily storing said data, and a storage device control unit (4) for controlling the recording and reproducing of the data to and from said data storage device (6, 7) and said cache memory (5), said data storage device including main storage means (6) for storing said data and work storage means (7) for temporarily storing said data, and said storage device control unit first writing recording data transmitted from a host device (1) into said work storage means and said cache memory (5) and then writing the data of said cache memory (5) into said data storage device in accordance with write-back system so as to decrease the number of recording operations performed on said main storage means.
Claim 6
Dependent Claim
141 words
An information recording and reproducing apparatus comprising a data storage device (6, 7) for recording and reproducing data, a cache memory (5) for temporarily storing said data, and a storage device control unit (4) for controlling the recording and reproducing of the data to and from said data storage device (6, 7) and said cache memory (5), said data storage device including main storage means (6) for storing said data and work storage means (7) for temporarily storing said data, and said storage device control unit first writing recording data transmitted from a host device (1) into said work storage means and said cache memory (5) and then writing the data of said cache memory (5) into said data storage device in accordance with write-back system so as to decrease the number of recording operations performed on said main storage means.
Claim 7
Dependent Claim
62 words
An apparatus as according to claim 5, wherein said storage device control unit (5) writes the data into said work storage means in order of arrival as a sequential file so as to average out the number of record accesses to a sector of said work optical disk drive and to decrease the number of record operations performed in a particular sector.
Claim 8
Independent Claim
24 words
An apparatus according to any one of the preceding claims wherein said data and work data storage devices or means are optical disk drives.
Claim 9
Dependent Claim
29 words
An apparatus according to claim 6, wherein said work optical disk drive, moves its read/write head to the track most recently recorded on, after a read or write operation.
Claim 10
Dependent Claim
27 words
An apparatus according to claim 6 or 7, wherein said work optical disk drive is adapted to record data on a spiral track on an optical disk.
References Cited (Backward Citations)
No citation records indexed.
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