Defect inspection method of magnetic disk, device therefor,...

Details Defect inspection method of magnetic disk, device therefor,... Defect inspection method of magnetic disk, device therefor,...

2007-09-12

2009-12-22

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

Reexamination Certificate

active

07636217

ABSTRACT:
Embodiments of the present invention efficiently conduct a test for detecting defects on a magnetic disk more accurately. According to one embodiment, a HDD carries out defect inspection of a magnetic disk using thermal fly height control (TFC). Changing a clearance by the TFC achieves defect inspection tests under varied test conditions without much decrease of throughput in manufacturing HDDs. First, a self analysis test (SAT) is carried out in a state that a heater power of P2is supplied to a heater. Then, another SAT is carried out in a state that a heater power of P1is supplied to the heater. The heater power P2is larger than the heater power P1.

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