Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2006-06-06
2006-06-06
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
Reexamination Certificate
active
07057835
ABSTRACT:
A method for providing data to determine an optimal track per inch (“TPI”) density for a head of a hard disk drive. The method utilizes a VGA control signal that is used in an automatic gain control loop of the disk drive. First VGA values are stored during a routine where a head reads the disk at different offset positions across an N track. The head is then moved to an offset position of an adjacent track N+1 and then erases at least a portion of the N+1 track. Second VGA values are then stored as the head again reads the N track at different offset positions of the track. This process is repeated for a plurality of different TPI values. The effective head width is determined from the second VGA values are plotted relative to different TPI values. An optimum TPI value can be determined from this plot.
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Chan Tom
Wu Yunxiang
Aiello Jeffrey P.
Hudspeth David
Irell & Manella LLP
Rodriguez Glenda P.
Yorks Ben J.
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