G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/00 (2006.01) G06F 3/06 (2006.01) G11B 7/007 (2006.01) G11B 7/085 (2006.01) G11B 20/12 (2006.01) G11B 27/036 (2006.01) G11B 27/10 (2006.01) G11B 27/11 (2006.01) G11B 27/19 (2006.01) G11B 27/30 (2006.01) G11B 27/32 (2006.01) G11B 27/034 (2006.01)
Patent
CA 2038583
An information recording and reproducing device uses a recording medium which is provided with units composed of blocks and a unit information recording area. The recording area contains unit allocation information, sector number information indicating the number of sectors per unit, and unit number information identifying each unit. When the recording medium is placed in the device, the respective information is read by a calculating unit and is used forcalculating physical sector numbers corresponding to a block specified in recording and reproduction operations. Access operations are performed to the calculated sectors, which allows the desired information to be recorded. The block includesdummy sectors which are added before and after each group of a predetermined number of effective sectors. When high-volume information is recorded over several blocks, the dummy sectors may be provided only for the first and last blocks. The device records a group of information whose volume varies from the smallest block number toward the larger block numbers, while it records a group of information whose volume is fixed from the largest block number. Thus, the recording area iseffectively used. The device easily conducts the information management when a host device specifies a block. The file management may be executed by providing a unit for recording file management information separately from a unit for recording files.
Kojima Kunio
Maeda Shigemi
Okumura Kazuaki
Terashima Shigeo
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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