| 摘要 |
<p>Position control for a read head with respect to a track on a storage disk is improved using a synchronization pattern that includes servo information as well as synchronization signals used to set a clock for recovering data from a disk. A disk stores data along substantially concentric tracks positioned at varying radii on the disk's data storage surface, with the data organized into data blocks. Synchronization patterns are provided at the start of each data block from which a read head can derive a synchronization signal useful for reading data from the data block. This synchronization signal is input to a phase locked oscillator to train a phase locked detector that recovers data signals stored in the data block. Servo information, suitable for identifying a misalignment between the read head and the track being read is also provided within the synchronization pattern. This may be accomplished by providing a conventional synchronization pattern modulated with a two dimensional servo pattern that includes information about the relative position of the read head with respect to a track. Conventional sector or wedge servo information for positioning the read head with respect to a track may be provided in addition to the servo data provided for each data storage block.</p> |
