Reading tracks from a media during back-EMF velocity control
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorFernando Zayas
Life of this patent
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Abstract
A method in accordance with the present invention includes determining a set of tracks scanning during testing of the disk surface for defects. An average load position or a load position a slider over a disk surface from a ramp during loading and unloading from the disk surface is determined by performing repeated loading and unloading while determining a first de-modulated track. Once the average load position or load position range is determined, the information can be combined knowledge of the slider ABS geometry to assign a set of tracks for scanning.
Claims16
A method of testing a disk surface in a hard disk drive having a rotary actuator, a slider operably connected with the rotary actuator, a head associated with the slider, and a ramp to remove the slider from communicative proximity with the disk surface, the method comprising:
- loading the slider onto the disk surface;
- reading information on the disk surface with the head;
- identifying a track number based on said information;
- determining an approximate load position based on said track number;
- assigning a set of tracks to scanned based on the approximate load position;
- and
- scanning said set of tracks with the head.
A method of testing a disk surface in a hard disk drive having a rotary actuator, a slider operably connected with the rotary actuator, a head associated with the slider, and a ramp to remove the slider from communicative proximity with the disk surface, the method comprising:
- loading the slider onto the disk surface;
- reading information on the disk surface with the head;
- identifying a track number based on said information;
- determining an approximate load position based on said track number;
- assigning an inner boundary to begin scanning a plurality of tracks based on the approximate load position;
- and
- scanning the plurality of tracks with the head starting from the inner boundary and moving toward the ramp.
A method of testing a disk surface in a hard disk drive having a rotary actuator, a slider operably connected with the rotary actuator, a head associated with the slider, and a ramp to remove the slider from communicative proximity with the disk surface, the method comprising:
- performing a plurality of load/unload sequences, a load/unload sequence including:
- loading the slider onto the disk surface;
- reading information on the disk surface with the head;
- identifying a track number based on said information;
- determining an approximate load position based on said plurality of load/unload sequences;
- assigning an inner boundary to begin scanning a plurality of tracks based on the approximate load position;
- and
- scanning the plurality of tracks with the head starting from the inner boundary and moving toward the ramp.
Dependencies are inferred from the claim text.