Dynamic information storage or retrieval – Condition indicating – monitoring – or testing
Reexamination Certificate
2005-07-07
2008-10-21
Hindi, Nabil Z (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
C369S053140
Reexamination Certificate
active
07440371
ABSTRACT:
An open-loop test procedure under high rotating speed is entered to compute a first TE crossing track number. The first TE crossing track number greater than a first threshold indicates an unbalanced disc and results in a low-speed reading procedure. On the other hand, the first TE crossing track number less than a second threshold value that is less than the first threshold value indicates a normal disc and results in a high-speed reading procedure. When the first TE crossing track number lies between the first and second threshold values, another open-loop test procedure under low rotating speed is entered to compute a second TE crossing track number. A low-speed reading procedure is performed when the second TE crossing track number is greater than a third threshold value, and a high-speed reading procedure is performed when the second TE crossing track number is less than the third threshold value.
REFERENCES:
patent: 6195322 (2001-02-01), Ohtani et al.
patent: 6236630 (2001-05-01), Kubo et al.
patent: 6636469 (2003-10-01), Tomishima
patent: 6965548 (2005-11-01), Chen
Hsieh Jen-Kuei
Pan Yi-Chuan
Hindi Nabil Z
Kirton & McConkie
Lite-On it Corp.
Witt Evan R.
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