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Low Round Per Minute Burnishing/Scrubbing with Non-Disturbed Head Servo Information from Thermal Asperity

IP.com Disclosure Number: IPCOM000117438D
Original Publication Date: 1996-Feb-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Arai, K: AUTHOR [+4]

Abstract

Disclosed is a method to get correct servo information by changing head selection from disturbed head, when lower rotational speed is applied around read/write error location, to burnish/scrub disk thermal asperity, on the Hard Disk Drive (HDD) system with magneto resistive head.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Low Round Per Minute Burnishing/Scrubbing with Non-Disturbed Head
Servo Information from Thermal Asperity

      Disclosed is a method to get correct servo information by
changing head selection from disturbed head, when lower rotational
speed is applied around read/write error location, to burnish/scrub
disk thermal asperity, on the Hard Disk Drive (HDD) system with
magneto resistive head.

      When disk thermal asperity disturbs read/write operation
continuously with selected head, asperity crushing by harder contact
between disk asperity and head slider at lower RPM or by scrubbing
around target track or it's combination is known as error recovery
method.

      If thermal disturbance is accelerated by above operation,
servo area quality of gray code and of wedge burst, can be too poor
to continue desired burnishing and scrubbing by wrong head
positioning accuracy on the disk.

      To avoid such a situation, head selection is changed from
disturbed head to other during burnishing/scrubbing period when data
read/write hasn't happened as retry with original head selection.