Determine the pattern of data corruption or loss!
It writes 8-byte segments to the test file. Each has a 4-byte magic value and another 4 bytes to indicate the offset of the segment. This enables the detection of corrupt segments and malalignment (e.g. in case of data loss).
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Create new test file of sufficient size:
$ truncate -s [SIZE] [FILE]
$ cpatt w [FILE] -
After manipulation, test for corruption:
$ cpatt t [FILE]