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|
Patent applications by Hitachi Global Technologies Netherlands, B.V.