Data error detection during media write

Details Data error detection during media write Data error detection during media write

2005-08-04

2009-11-24

Torres, Joseph D (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S755000

Reexamination Certificate

active

07624328

ABSTRACT:
Data error detection comprises storing in a first buffer data to be written to a medium and a first digital signature of the data. If the first digital signature matches a second digital signature of data read from the first buffer, a compressed form of data read from the first buffer is stored in a FIFO. If the first digital signature matches a third digital signature of an uncompressed form of the compressed data, the uncompressed form of the compressed data, a C2 ECC of a first C1 ECC of the uncompressed form of the compressed data, and one or more C1 ECCs comprising the first C1 ECC and a second C1 ECC of the C2 ECC are stored in a second buffer. Success is indicated if the one or more C1 ECCs match corresponding C1 ECCs calculated from data and C1 ECCs read from the second buffer, and if a C1 ECC of the data read from the second buffer and written to a medium matches a C1 ECC of corresponding data read back from the medium.

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Fegreus, “An LTO-2 Drive with an Edge or Two”, downloaded from http://www.open-mag.com/features/vol—103/LT02//LTO2.htm, Aug. 4, 2004, pp. 1-8.

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