Hitachi HUS157336EL3600 - Manual (Page 21)

Drawing No. Sheet No. Revision 5
K6602906 21/46 2003/6/12
(8) Tagged Command Queuing
A maximum of 110 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.