Monitoring of phenomena indicative of PTP in a magnetic disk...

Details Monitoring of phenomena indicative of PTP in a magnetic disk... Monitoring of phenomena indicative of PTP in a magnetic disk...

2005-12-27

2005-12-27

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

Reexamination Certificate

active

06980383

ABSTRACT:
A PTP test subsystem of a magnetic disk drive identifies an undesired pole tip protrusion (PTP) condition, and takes steps to prevent problems associated with PTP. A PTP stressing mechanism stresses the disk drive during a PTP test mode to induce a PTP condition. A disk contact detection circuit detects when a head of the disk drive contacts the disk. A PTP write current determining circuit is also provided which comprises a write current level detector to ascertain a write current level at which the disk contact detection circuit detects when the head of the disk drive contacts the disk while the disk drive is stressed during the PTP test mode.

REFERENCES:
patent: 5594595 (1997-01-01), Zhu
patent: 5863237 (1999-01-01), Felts et al.
patent: 6084741 (2000-07-01), Kim
patent: 6195219 (2001-02-01), Smith
patent: 6693769 (2004-02-01), Hsu et al.
patent: 2002/0036850 (2002-03-01), Lenny et al.

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