Track based multiple sector error recovery
Error correction in a disk drive is performed by identifying all errors in multiple sectors of a single track during a single read operation. As the data from the track is moved to a buffer, the disk drive records the location of the errors without stopping the read operation. Following the read operation, error recovery is performed on all errors identified in the track. If further error recovery is needed on the track, a subsequent read operation may then be performed.
1 . A method for error recovery in a disk drive comprising:
detecting an error during data transfer;
continuing the data transfer by reading multiple sectors in a track during a single read operation and identifying all sector errors in the multiple sectors; and
recovering the sector errors.
2 . The method of claim 1 , further comprising reading all the sectors in a track during a single revolution of the disk.
3 . The method of claim 1 , further comprising determining if further read operations are necessary to recover any sector errors.
4 . The method of claim 3 , further comprising re-reading multiple sectors in a track during a subsequent read operation to recover any additional sector errors.
5 . The method of claim 1 , further comprising failing the transfer if any errors are not recoverable.
6 . The method of claim 1 , further comprising completing the track read when all errors are recovered.
7 . The method of claim 1 , further comprising maintaining a record of what sectors moved to a buffer are in error.
8 . A disk drive comprising:
a read head;
a data storage medium formatted into a plurality of data tracks; and
control circuitry which performs a data transfer between the read head and the data storage medium, wherein the control circuitry identifies multiple sector errors in a first of the plurality of data tracks during a single read operation and records the location of the errors.
9 . The disk drive of claim 8 , wherein the data read from the first of the plurality of tracks is moved to a buffer during the read operation.
10 . The disk drive of claim 8 , wherein the control circuitry recovers the errors.
11 . The disk drive of claim 10 , wherein the control circuit determines if further read operations are necessary to recover any additional sector errors and rereads the first of a plurality of tracks during a subsequent read operation to recover any additional sector errors.