A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks, wherein the head comprises a write element and a read element. An asperity in a target data track is detected, and a range of data tracks proximate the target data track is mapped out, wherein the range of data tracks spans at least twice a radial offset between the read element and the write element at the radial location of the target data track.

Disk drive mapping out data tracks to avoid thermal asperities

A method to enable defect margining of a disk drive may comprise executing a data access command on a target sector on the disk drive. Upon encountering a data access error at the target sector, an address of the target sector may be added to an error list. The address of the target sector in the error list may then be converted to a physical location on the disk drive. A thermal asperity scan may be performed at and around the physical location and, upon detecting a thermal asperity, and at least sectors around the detected thermal asperity may be margined, and the data stored within the margined sectors may be relocated. Instead of sectors, entire tracks may be margined and the data stored therein relocated to a spare or reserve location, one track at a time.

Methods and devices for preventing potential media errors from growing thermal asperities

A data storage device may comprise a disk comprising a plurality of zones, each comprising a plurality of data tracks, a head having a reader spaced away from a writer by a gap, and a controller. The controller may be configured to, upon detecting a media defect in one of the zones: determine a width of data tracks in the zone in which the media defect is detected; calculate a minimum number of contiguous tracks in the zone in which the media defect is detected whose aggregate width is at least as great as the gap between the reader and writer; and margin the detected media defect with a number of tracks immediately adjacent to the detected media defect that is at least equal to the calculated minimum number of contiguous tracks.

Methods and devices for adaptive margining

A disk drive including a disk storing a defect log including one or more defect records, wherein each of the defect records spans multiple words and comprises chunks which are word aligned, each chunk comprising one or more record fields, and a controller configured to read the defect records on a word basis. A method for performing a defect process on the disk drive including selecting a defect record from the defect log, selecting record fields in the selected defect record, reading the selected defect record on a word basis, and searching the selected record fields which are located in a same chunk of the selected record at a same time to determine when the selected defect record matches a target defect record.

Method and apparatus for performing a defect process on a data storage device

Systems, methods, devices, circuits for data processing, and more particularly to systems and methods for data processing to identify a defect on a medium.

Systems and Methods for Multi-Track Media Defect Detection

The disclosure is directed toward systems and methods of defect description of a data storage medium. In a particular embodiment, a method includes determining a first defect of a data storage medium. The method also includes determining a format of an entry of a defect description table based on the first defect and a location of a second defect of the data storage medium. The format is selected from one of a plurality of formats. The method also includes storing a description of the first defect in the entry of the defect description table in the format.

System and method of defect description of a data storage medium

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System and method of defect description of a data storage medium