Systems, apparatus, and methods to determine thermal decay...

Details Systems, apparatus, and methods to determine thermal decay... Systems, apparatus, and methods to determine thermal decay...

2007-04-24

2007-04-24

Tsai, Carol S. W. (Department: 2857)

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

C702S069000, C360S031000, C360S053000, C360S066000, C360S068000, C360S069000, C360S078040, C360S078060

Reexamination Certificate

active

10172515

ABSTRACT:
The thermal decay of data written to a magnetic mass storage medium is determined by measuring and analyzing the time-domain equalized-signal-to-noise ratio (ESNR) and equalized signal-to-total-distortion noise ratio (ESTDR) of written data. In some embodiments, a test track and a reference track are initialized from data. Subsequently, the reference track is re-initialized from the test data, and the time-domain ESNR and/or ESTDR measurements are made of the test track and the reference track, at predetermined time intervals. Later, the time-domain ESNR and ESTDR measurements are analyzed to determine the thermal decay of the data written. In another embodiment of the present invention, the ESNR and/or ESTDR measurements includes reading the data through a non-return-to-zero bus in phases, in which the phases are selected in sequence.

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