Method and apparatus for estimating touchdown of a slider in...

Details Method and apparatus for estimating touchdown of a slider in... Method and apparatus for estimating touchdown of a slider in...

2009-05-08

2011-10-18

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000

Reexamination Certificate

active

08040630

ABSTRACT:
A hard disk drive using an increase in servo address mark delays to create a touchdown flag in response to a slider making contact with a rotating disk surface while accessing a track. This may be used particularly when the track being accessed is located away from the Inside Diameter (ID). The hard disk drive may further use resistive heater electrical readings to determine the touchdown flag for track locations near the ID. The hard disk drive may be calibrated during manufacture and/or may be recalibrated in the field with this method. The calibrated hard disk drive is a product of this method. The method may be used during normal access operations and/or may be embodied as a program system residing in computer readable memory for instructing a computer operating the hard disk drive, where the computer and/or the memory may or may not be included in the hard disk drive.

REFERENCES:
patent: 7477470 (2009-01-01), Leis et al.
patent: 7605996 (2009-10-01), Baumgart et al.

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