Patent ID: 7889449
Filing Date: 2011-02-15
Classification: G11B

Abstract:
1. A memory device comprising: a medium including a plurality of tracks, each of which has a plurality of sectors separated by a plurality of servo areas, for storing data in the sectors of the tracks; a head for writing data into and reading data from the medium; and a controller for determining whether the head has read out data from a sector on a target track correctly or not in reference to information obtained from servo areas sandwiching the sector and for driving the head so as to retry reading out data from the sector when the controller determines that the head failed to have read out data on the target track, wherein the controller comprises a first counter for counting a count value of thereof at an end of a sector, a second counter for counting a count value of thereof when data is read out with ECC of the data completed, a third counter for holding a count value thereof until servo information is obtained and a fourth counter for holding a count value of the third counter until a verification signal of the next servo information is outputted.