Magnetic disk apparatus having duplicate sync byte patterns
AssigneeFujitsu Limited
InventorYoshihiro Hashimura
Life of this patent
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Abstract
A writing unit writes a first sync byte pattern SB1 to the head of data and writes a second sync byte pattern SB2 to the end of the data (DATA+ECC). When the first sync byte pattern SB1 is not detected, the data is stored into a memory, and after that, a reading unit reads out the second sync byte pattern SB2 in the memory. When the second sync byte pattern SB2 is detected, the reading unit reads out the data of a predetermined length DL in which a position that is preceding to the detecting position by only a predetermined data length (DL) is set to the head position from the memory and demodulates.
Claims13
A magnetic disk apparatus for writing and reading information to/from tracks of a medium on a sector unit basis by using a head having a write head and a read head, comprising:
- a writing unit constructed in a manner such that when data including an error detection correction code is written into a sector region, a first sync byte pattern is written to the head of said data and a second sync byte pattern is written to the end of said data;
- and
- a reading unit constructed in a manner such that read data read out from said sector region is written into a memory in parallel with a demodulation of the data by a demodulating unit, and when said first sync byte pattern cannot be detected from said demodulation data, the data stored in said memory is read back from an end gap side, said second sync byte pattern is detected, data of a predetermined length preceding said second sync byte pattern is read out from said memory, and said memory read-out is demodulated in said demodulating unit.
A magnetic disk apparatus for writing and reading information to/from tracks of a medium on a sector unit basis by using a head having a write head and a read head in which each of said sectors is mutually separated by a gap provided at each of a sector head and a sector end, comprising:
- a reading unit constructed in a manner such that read data read out from said sector region is written into a memory in parallel with a demodulation of the data by a demodulating unit, and when said first sync byte pattern cannot be detected from said demodulation data, the data stored in said memory is read back from an end gap side, said second sync byte pattern is detected, data of a predetermined length preceding said second sync byte pattern is read out from said memory, and said memory read-out is demodulated in said demodulating unit.
Dependencies are inferred from the claim text.