Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2011-06-28
2011-06-28
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
Reexamination Certificate
active
07969678
ABSTRACT:
In one embodiment, a magnetic disk drive includes a magnetic disk, a head slider for flying above the spinning magnetic disk, a pattern analyzer for analyzing a data pattern of data to be recorded on the magnetic disk to determine a recording current reversal timing and a recording assistance area in accordance with the analysis so that the rear end of the determined recording assistance area is shifted forward if the determined recording current reversal timing is earlier than a criterion, or the rear end of the determined recording assistance area is shifted backward if the determined recording current reversal timing is later than the criterion, a recording assistance element on the slider for forming the determined recording assistance area on the magnetic disk, and a recording element for recording the data on the magnetic disk using the recording current in accordance with the determined recording current reversal timing.
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Maeda Hideaki
Mochizuki Masafumi
Tanabe Hiroyasu
Zaitsu Hideki
Hitachi Global Storage Technologies - Netherlands B.V.
Tzeng Fred
Zilka-Kotab, PC
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