Bit 7
Address Valid: When this bit is set
to 1, the logical block address field is valid.
Bits
6 - 4
Error Class: When the error class
is 0, the sense data block is in the format shown above. When the error
class is 7, the sense data block is in the extended format, shown on the
following page. All other settings are device dependent.
Bits
3 - 0
Error Code: Errors are device dependent.
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