Patent ID: 7978428

Claim:
In a disk drive unit comprising at least one disk having a plurality tracks, wherein the at least one track includes a data sector divided by at least a first servo sector so as to have at least a first data sector portion on a first side of the first servo sector, and at least a second data sector portion on a second side of the first servo sector, and a head for reading data from the data sector, a method comprising: positioning the head at a first offset position with respect to a track; reading data from the data sector with the head at the first offset position; and when a read error is detected between the first data sector portion and the second data sector portion: storing the data read from the first data sector portion in a memory, moving the head to a second offset position with respect to the track including the data sector being read, reading data from the second data sector portion with the head at the second offset position, and storing the data read from the second data sector portion in the memory.