Magnetic disk drive to alleviate damage from thermal asperity

Details Magnetic disk drive to alleviate damage from thermal asperity Magnetic disk drive to alleviate damage from thermal asperity

2007-08-07

2007-08-07

Wong, K. (Department: 2627)

Boots, shoes, and leggings

Protectors

Sole and/or heel

C360S025000, C360S048000

Reexamination Certificate

active

11355457

ABSTRACT:
Embodiments of the invention prevent or alleviate head damage ascribable to the TA-causing sections (projections) of disks (TA is thermal asperity). With respect to a TA-causing section that has been detected during initial defect registration, X±A tracks in a radial direction and Y±B sectors (or Y±B bytes of space) in a circumferential direction, with the TA-causing section as a center, are registered collectively during primary registration. Following this, secondary registration is conducted to register a region ranging from±several tens of tracks to several hundreds of tracks present in a radial direction, and all sectors (or all bytes of space) present in a circumferential direction, with a track of the detected TA-causing section as a center. Furthermore, a cylinder of a region equivalent to the same radial positions as those of the secondary registration is registered (as tertiary registration) for all disks, except for the disk where the TA-causing section was detected. If an available data storage capacity of the magnetic disk drive reaches or exceeds a certain rate with respect to an overall capacity of the drive, the tertiary registration and the secondary registration are released and removed from registered TA sections.

REFERENCES:
patent: 6490691 (2002-12-01), Kimura et al.
patent: 10-003603 (1998-01-01), None
patent: 11-066709 (1999-03-01), None
patent: 2000-293946 (2000-10-01), None

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