Hitachi DK32EJ - Ultrastar Series 36.9 GB Hard Drive Reference Manual page 164

Bit 6 : ARRE (Automatic Read Reallocation for defective data blocks Enabled)
Bit 5 : TB (Transfer Block)
Bit 4 : RC (Read Continuous)
MODE SELECT:(15h)
6 COMMAND DESCRIPTIONS
The drive performs automatic reallocation upon the abnormal
termination of write operation after the drive proceeds error recovery
process which is specified by mode select.
The drive shall create CHECK CONDITION status with sense key of
MEDIUM ERROR when the drive fails to do automatic reallocation.
When set to 0, this bit indicates that the controller does not perform
automatic reallocation of defective data blocks during write operations.
When set to one, allows the controller to automatically relocate bad
blocks detected during read operations.
This function is applied to READ, READ EXTENDED command.
The drive performs automatic reallocation if the data recovery has
been done normally after the drive proceeds error recovery process
which is specified by mode select.
The drive shall create CHECK CONDITION status with sense key of
MEDIUM ERROR when the drive fails to do automatic reallocation.
When set to 0, this bit indicates that the controller does not perform
automatic reallocation of defective data blocks during read operations.
When set to 1, this bit specifies that the data in the error block
(recoverable or unrecoverable) is to be transferred to the host
computer.
When this bit is set to 0, it specifies that the error block data is not to
be transferred to the host computer.
Note : In either case, the information byte area of the sense
data is loaded with the error block address.
When set to 1, this bit specifies that the controller is to transfer the
entire requested length of data without attempting an error recovery
procedure. The controller may send data which may be fabricated
(e.g., garbage data in the buffer) to maintain a continuous flow of data.
This bit is given precedence over the other bits in this byte.
When this bit is set to 0, it indicates that error recovery operations
which cause reasonable delays are acceptable during the data transfer.
OEM MANUAL:K6602771
Revision: 2 / Date: 2002.12.19
Page: 164 / 313