Patent ID: 6131147
Filing Date: 2000-10-10
Classification: G06F,G11B

Abstract:
A data access apparatus comprising:a plurality of storage cells to keep a plurality of highly frequently accessed optical storage media to store more frequently accessed data and less frequently accessed media to store less frequently accessed data;at least one optical disc drive to have one of the plurality of optical storage media loaded therein and to write and to read data into and from the loaded optical storage media;an accessor to load one of the optical storage media kept in one of the storage cells into one of the at least one optical disc drive or to remove the one of the storage media loaded in the one of the at least one optical disc drive and returning the one of the at least one optical disc drive to the one of the storage cell;a cache memory to store cache data for the optical media;a cache HDD to store modified data outputted from the cache memory or data having an access frequency larger than a specified value and not being stored in one of the highly frequently accessed optical storage media; anda number of highly frequently accessed disc update section to obtain an amount of data actually frequently accessed from a data access history and for computing a number of highly frequently accessed optical storage media on the basis of an amount of data and for setting the number of the highly frequently accessed optical storage media at the number of frequently accessed optical storage media computed by the disc update section.