Magnetic disk device and data read and write method
AssigneeKabushiki Kaisha Toshiba
InventorKana Furuhashi
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a magnetic disk device includes a read and write channel transfers data to/from a magnetic disk; a data processor cancels an inter-track interference in data read; an encryption decode processor which is provided in common through a write data path and a read data path in the read and write channel and executes an encryption processing and a decode processing for the data to be transferred to/from the magnetic disk; and an encryption decode processing bypass module bypasses the encryption processing or the decode processing through the encryption decode processor in a cancellation of the inter-track interference in the data processor.
Claims14
A magnetic disk device comprising:
- a read and write channel configured to transfer data to and from a magnetic disk, data stored in the magnetic disk being in encrypted state;
- a buffer configured to store write data to be written to the magnetic disk and read data read out from the magnetic disk;
- a cipher processor coupled to a write data path and a read data path of the read and write channel and configured to encrypt and decrypt data to be transferred to and from the magnetic disk;
- a data processor configured to cancel an inter-track interference by reading data on the read path from an adjacent track to a track where write data to be written and concurrently receiving the write data encrypted by the cipher processor on the write path from the buffer, data read out from the adjacent track to be written back to the magnetic disk;
- and
- a bypass module configured to bypass an encryption process and a decryption process of the cipher processor with respect to data read out from the adjacent track when the inter-track interference is cancelled by the data processor.
A data read and write method by a magnetic disk device comprising:
- transferring data to and from a magnetic disk by using a read and write channel, data stored in the magnetic disk being in encrypted state;
- storing data to be written to the magnetic disk and read data out from the magnetic disk in a buffer;
- encrypting and decrypting data to be transferred to and from the magnetic disk in a write data path and a read data path of the read and write channel;
- cancelling an interference by reading data on the read path from an adjacent track to a track where write data to be written and concurrently receiving the write data in encrypted state on the write path from the buffer, data read out from the adjacent track to be written back to the magnetic disk;
- and
- bypassing the encrypting and decrypting with respect to data read out from the adjacent track when the inter-track interference is cancelled.
Dependencies are inferred from the claim text.