Hitachi HUS103036FL3800 - Manual (Page 21)

Drawing No. Sheet No. Revision
K6610091 21/43 2005/2/23
(8) Tagged Command Queuing
A maximum of 128 commands can be enqueued to this drive. The drive does not
have to connect and disconnect to the host controller even if the SCSI command has
been issued successively, so the overhead time of the SCSI bus can be reduced.
(9) S.M.A.R.T. (Self - Monitoring, Analysis and Reporting Technology)
This function helps predict a failure related to the degradation of the disk drive itself.
For users seeking to use the drive as long as possible, S.M.A.R.T. can be used to
predict when failure might occur. The user can use this information to back-up the
data before failure.
The S.M.A.R.T. report is written on the disk at regular intervals that are not based on
drive usage.
(10) Automatic Read Reallocation
When an error is detected on reading the data, this function automatically assigns
an alternate sector in place of the defective sector and stores the data on the
alternated sector.
(11) Write Cache
The controller can return a completion of a WRITE command with a GOOD status
after receiving the data from the host but before writing the data from its buffer to the
media.
The Deferred Error function reports an Disk Access Error to the host computer if an
error occurs when the data are being stored on the disk medium after the GOOD
status was already returned. In this case, any data still in the buffer (not yet written
to the media) is not assured.
(12) Log Save
Diagnostic information is written on the disk at regular intervals that are not based on
drive usage.