Determination of the quality of an erase process for...

Details Determination of the quality of an erase process for... Determination of the quality of an erase process for...

2011-06-28

2011-06-28

Negrón, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S066000

Reexamination Certificate

active

07969675

ABSTRACT:
Methods and test systems are disclosed for determining the quality of an erase process for perpendicular magnetic recording (PMR) disks. After performing an erase process on a PMR disk and before the PMR disk is assembled into a hard disk drive, a first test pattern of magnetization pulses is written to a region of the PMR disk. A second test pattern is subsequently read from the region of the PMR disk. The second pattern of magnetization pulses is analyzed in relation to the first test pattern and measured to determine the quality of the erase process.

REFERENCES:
patent: 7079345 (2006-07-01), Nguy et al.
patent: 7589924 (2009-09-01), Yoshizawa

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