Magnetic hard disk drive
View Patent ↗A hard disk drive and magnetic medium including a servo area, a data area divided into a plurality of sector blocks and at least one micro-servo area disposed between two sector blocks. There may be a micro-servo area immediately preceding each of the plurality of sector blocks. The micro-servo areas include an address mark and a track parity check code that allow the detection of an external shock that causes the recording (write) head to skip to an adjacent track in the hard disk medium. The micro-servo area is smaller than the servo areas, and various numbers of different track parity check codes can be used for different resolution of shock detection. An acceleration sensor may also be provided to detect larger external shocks. By detecting various external shocks with improved accuracy, and aborting the recording operation of data if an external shock is detected, the corruption of data in adjacent tracks is substantially reduced to improve disk drive performance.
1. A magnetic hard disk drive comprising:
a magnetic hard disk comprising servo areas and data areas divided into a plurality of sector blocks,
a magnetic head comprising a reproducing element and a recording element, and
a data processing circuit for processing magnetic information input or output from the magnetic head,
wherein the data area have at least one micro-servo area comprising IDAM field and a parity code field, formed between at least two of said plurality of sector blocks,
the data processing circuit has an IDAM detector, a memory for a parity code, and comparator that compares a parity code, and comparator that compares a parity code of a target recording track with the parity code in the memory, and
a HDC that output the parity code of a target recording track to the comparator.
2. A magnetic hard disk drive according to claim 1 , wherein the HDC shifts to the comparison of the parity code of a target recording track and the parity code in the memory involving disk rotation waiting, in case that they are not matched with each other.