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Hitachi Global Technologies Netherlands, B.V.
| Hitachi Global Technologies Netherlands, B.V. Patent applications | ||
| Patent application number | Title | Published |
|---|---|---|
| 20080244359 | Techniques For Correcting Errors Using Iterative Decoding - Techniques are provided for iteratively decoding data recorded on a data storage device. An iterative decoder decodes the data using multiple decoding iterations to correct errors. In multiple iterations of the iterative decoder, a post processing block generates soft information, and a decoder applies a minimum sum decoding algorithm to a low density parity check (LDPC) code to generate extrinsic information based on the soft information and updated soft information. | 10-02-2008 |
| 20080204926 | Techniques For Identifying Servo Sectors In Storage Devices - Techniques are provided for identifying the servo sectors in a track on a data storage device. A data storage device identifies the servo sectors in a track by reading distributed index bits from multiple servo sectors in a track. The data storage device analyzes only one index bit from each servo sector to identify the index of a track. In some embodiments, the index of a track can be identified after examining the index bits stored in a particular number of consecutive servo sectors, even in the presence of errors. The index bits in each track can have an error tolerance with a minimum Hamming distance greater than one. In other embodiments, a data storage device compares a sliding window of the index bits read from the servo sectors to all possible N-bit vectors that exist within a pattern of the index bits stored on a track. | 08-28-2008 |