| 摘要 |
In a magnetic tape drive for accessing a magnetic tape contained in a memory built-in cartridge, a logical beginning of tape is assigned and updated for the magnetic tape that is being accessed. The quality of data that is read from the magnetic tape is monitored and the number of times the magnetic tape has been accessed is recorded. It is determined whether the quality of data that is read and the number of times the magnetic tape has been accessed satisfy predetermined criteria. When the criteria are satisfied, the logical beginning of tape is caused to be updated. Information on the logical beginning of tape position of the magnetic tape is stored to the built-in memory. When the magnetic tape is loaded, the information on the logical beginning of tape position of the magnetic tape is read from the built-in memory.
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