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Home I/O Systems Optical-disk-playback-and-recording-device-which-alternately-allocates-logical-addresses-on-different-sides-of-disk

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 Optical disk playback and recording device which alternately allocates logical addresses on different sides of disk

Details
Inventors: Sanada, Satoru;
Assignee: Nikon Corporation (Tokyo, JP)
Primary Examiner: Neyzari; Ali
Assistant Examiner:
Attorney, Agent or Firm:

An optical disk playback and recording device has a control unit which alternately allocates sequential logical addresses between single or multiple continuous sectors on each side of a two-sided optical disk with disk regions divided into tracks having sectors. The device also has first and second playback and recording heads, one disposed on each side of the disk, playing back data from or recording data to sectors identified by the logical addresses of data for playback or recording. Such a device achieves increased data transmission speeds by allowing access to data occupying alternately located sectors on each side of the optical disk by both the first and second heads. The control unit also controls access to such an optical disk. Where the optical disk playback and recording device has a higher playback and recording frequency for tracks located toward the periphery of the disk, the device can achieve both uniform and increased data transmission speeds. The device has a control unit alternately allocating sequential logical addresses to a varying number of continuous sectors between sectors in tracks located toward the center of one side of the disk and sectors in tracks located toward the periphery of the other side of the disk. The control unit also controls access to such an optical disk.

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide an optical disk playback and recording device having an increased on-line capacity.
It is a further object of the present invention to provide an optical disk playback and recording device having an increased data transmission speed and throughput.
It is another object of the present invention to provide an optical disk playback and recording device having logical addresses alternately arranged on both surfaces of the disk such that accessing of multiple continuous logical sectors may be accomplished by multiple playback and recording heads at the same time.
It is yet another object of the present invention to provide an optical disk playback and recording device having an increased and uniform data transmission speed in a disk system wherein the recording and playback frequency increases for tracks located toward the periphery of the disk.
Objects of the present invention are achieved by providing an optical disk playback device having a control unit alternately allocating sequential logical addresses between single or multiple continuous sectors on each side of a two-sided optical disk with disk regions divided into tracks having sectors, and first and second playback and recording heads, one disposed on each side of the disk, playing back data from, or recording data to, sectors identified by the logical addresses of data for playback or recording.
Objects of the present invention are also achieved by providing an optical disk playback and recording device with a two-sided optical disk with disk regions divided into tracks having sectors.
The device having a control unit alternately allocating sequential logical addresses to varying continuous sectors between sectors in tracks located toward the center of one side of the disk and sectors in tracks located toward the periphery of the other side of the disk, and first and second playback and recording heads, one disposed on each side of the disk, playing back data from, or recording data to, sectors identified by the logical addresses of data for playback or recording, wherein a higher playback and recording frequency is used for tracks located toward the periphery of the disk


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