Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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The following summarizes valid modes of operation. If an illegal mode is set, the MODE SELECT command will complete
successfully but the action of the drive when an error occurs is undefined.
PER DTE DCR TB DESCRIPTION
0 0 0 0 Retries and Error Correction are attempted. Recovered or corrected data (if any) or both are transferred
with no Check Condition status at the end of the transfer.
no err The transfer length is exhausted.
soft err The transfer length is exhausted. Transferred data includes blocks containing recovered errors.
hard err Data transfer stops when an unrecoverable error is encountered. The unrecoverable block is not
transferred to the Initiator. The drive then creates the Check Condition status with the appropri-
ate sense key.
0 0 0 1 Retries and Error Correction are attempted. Recovered or corrected data (if any) or both are transferred
with no Check Condition status at the end of the transfer.
no err The transfer length is exhausted.
soft err The transfer length is exhausted. Transferred data includes blocks containing recovered errors.
hard err Data transfer stops when an unrecoverable error is encountered. The unrecoverable block is
transferred to the Initiator. The drive then creates the Check Condition status with the appropri-
ate sense key.
0 0 1 0 Retries are attempted but no error correction (ECC) is applied. Recovered data (if any) are transferred with
no Check Condition status at the end of the transfer.
no err The transfer length is exhausted.
soft err The transfer length is exhausted. Transferred data includes blocks containing recovered errors.
hard err Data transfer stops when an unrecoverable error is encountered. The unrecoverable block is not
transferred to the Initiator. The drive then creates the Check Condition status with the appropri-
ate sense key.
0 0 1 1 Retries are attempted but no error correction (ECC) is applied. Recovered data (if any) are transferred
with no Check Condition status at the end of the transfer.
no err The transfer length is exhausted.
soft err The transfer length is exhausted. Transferred data includes blocks containing recovered errors.
hard err Data transfer stops when an unrecoverable error is encountered. The unrecoverable block is
transferred to the Initiator. The drive then creates the Check Condition status with the appropri-
ate sense key.
0 1 0 0 Illegal Request-DTE must be zero when PER is zero.
0 1 0 1 Illegal Request-DTE must be zero when PER is zero.
0 1 1 0 Illegal Request-DTE must be zero when PER is zero.
0 1 1 1 Illegal Request-DTE must be zero when PER is zero.
1 0 0 0 The highest level error is reported at the end of transfer. Retries and error correction are attempted. Recov-
ered or corrected data (if any) or both are transferred with Check Condition status and Recovered Error
sense key set at the end of the transfer.
no err The transfer length is exhausted.
soft err The transfer length is exhausted. Transferred data includes blocks containing recovered errors.
The information byte in the sense data will contain the LBA of the last recovered error.
hard err Data transfer stops when an unrecoverable error is encountered. The unrecoverable block is not
transferred to the Initiator. The drive then creates the Check Condition status with the appropri-
ate sense key.