| 摘要 |
PROBLEM TO BE SOLVED: To surely update an encryption key for encrypted data, without increasing a burden of processing, in a magnetic disk device for recording encrypted data. SOLUTION: A magnetic disk device includes: a magnetic disk for recording encrypted data; a magnetic head for reading or writing data from or to the magnetic disk; and a recording and reproducing circuit connected to the magnetic head for performing data read processing or data write processing. In the magnetic disk device, the recording and reproducing circuit has a data refresh function for reading data from the magnetic disk and writing the data back to the same place. Data read out by the data refresh function are decrypted and re-encrypted after changing an encryption key, and the encrypted data are written back. COPYRIGHT: (C)2011,JPO&INPIT
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