Abstract: A procedure for reading data stored on a data storage disc in a disc drive is disclosed. The procedure involves reading data from one or more sectors on the data storage disc after an error occurred while initially reading the sector(s) pursuant to a read command issued by a host computer. During the initial read, the procedure logs information pertaining to the sector(s) on the disc where an error occurred. The logged information is then used during the procedure to retrieve data from the sector(s) in a single revolution of the disc. The procedure uses a skip mask, a vector buffer management list and a data throttling mechanism to administer a transfer of data from a disc to a host computer via a data buffer.

Abstract: A disc drive includes a base and a disc rotatably attached to the base. A controller for a disc drive uses a system for mapping logical block addresses to actual location on a disc drive stores the number of skipped or defective sectors which occur prior to a target cylinder in a cylinder skip table. The system estimates a starting cylinder location for the selected logical block address. After estimating the cylinder location, a number of skipped defective sectors that have occurred prior to a cylinder start is determined. The starting location of the cylinder is slipped by this amount. A target track and associated head is also determined. Information in the track identification field is used to adjust the actual location on the track and to determine if a track seek to another track is needed.

Abstract: A read error recovery procedure is disclosed that administers subsequent accesses of a track of a disc drive following an initial access of the track wherein multiple errors were encountered as data stored on the sectors was retrieved by a read/write head. During the initial access, the procedure logs information pertaining to the sectors on the disc where an error occurred. The logged information is then used during the read error recovery procedure to retrieve data from the sectors in a single revolution of the disc. The read error recovery procedure uses a skip mask, a vector buffer management list and a data throttling mechanism to administer a transfer of data from a disc to a host computer via a data buffer.