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AssigneeHitachi Global Storage Technologies Japan, Ltd.
InventorMasayoshi Shimokoshi
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A magnetic disk drive improved in reliability of data retrieve. This invention prevents the drive from decoding already-written old data. The failure decoding is caused by a deviation in a write operation, by a malfunction of a writing head and so on. When data in a sector is renewed, the sector's location and renewal frequency information are saved not only in the sector of the disk media but also in a temporary memory. When the magnetic disk drive is in an idle mode, those renewal information written in the sector and stored in the temporary memory, are checked. If both renewal information match, the data is regarded “not old” and the information about the sector in the temporary memory is deleted. In the deleting operation, check mark information indicating that the written data has been checked is written in the sector of the magnetic disk medium.
A magnetic disk drive including a combination type magnetic head having a writing head and a reading head, a magnetic disk medium facing the combination type magnetic head, a mechanism for moving the magnetic head to a predetermined position on the magnetic disk medium, an electronic circuit having the function of reading or writing information, and a temporary memory, the magnetic disk drive comprising the functions of;
Dependencies are inferred from the claim text.