Seagate ST9500431SS ユーザーズマニュアル
Constellation SAS Product Manual, Rev. E
11
5.2.2
Format command execution time for 512-byte sectors (minutes)
ST9500430SS, ST9500431SS & ST9500432SS
Maximum (with verify)
216
Maximum (without verify)
108
Note.
There is approximately a 1.5 increase in time to format a SED drive versus a non-SED drive of the same capacity.
5.2.3
General performance characteristics
Minimum sector interleave
1 to 1
Data buffer to/from disc media (one 512-byte logical block)*
75 to 142 MBytes/sec
Sustained transfer rate
95 to 100 Mbytes/sec
SAS Interface maximum instantaneous transfer rate
600 Mbytes/sec* per port
(dual port = 1200 Mbytes/sec*)
Logical block sizes
512 (default), 520 or 528.
Read/write consecutive sectors on a track
Yes
Flaw reallocation performance impact (for flaws reallocated at format time using the
spare sectors per sparing zone reallocation scheme.)
spare sectors per sparing zone reallocation scheme.)
Negligible
Average rotational latency
4.16 msec
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or
from the host.
from the host.
5.3
Start/stop time
The drive accepts the commands listed in the SAS Interface Manual less than 3 seconds after DC power has
been applied.
been applied.
If the drive receives a NOTIFY (ENABLE SPINUP) primitive through either port and has not received a START
STOP UNIT command with the START bit equal to 0, the drive becomes ready for normal operations within 30
seconds (excluding the error recovery procedure).
STOP UNIT command with the START bit equal to 0, the drive becomes ready for normal operations within 30
seconds (excluding the error recovery procedure).
If the drive receives a START STOP UNIT command with the START bit equal to 0 before receiving a NOTIFY
(ENABLE SPINUP) primitive, the drive waits for a START STOP UNIT command with the START bit equal to 1.
After receiving a START STOP UNIT command with the START bit equal to 1, the drive waits for a NOTIFY
(ENABLE SPINUP) primitive. After receiving a NOTIFY (ENABLE SPINUP) primitive through either port, the
drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure).
(ENABLE SPINUP) primitive, the drive waits for a START STOP UNIT command with the START bit equal to 1.
After receiving a START STOP UNIT command with the START bit equal to 1, the drive waits for a NOTIFY
(ENABLE SPINUP) primitive. After receiving a NOTIFY (ENABLE SPINUP) primitive through either port, the
drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure).
If the drive receives a START STOP UNIT command with the START bit and IMMED bit equal to 1 and does
not receive a NOTIFY (ENABLE SPINUP) primitive within 5 seconds, the drive fails the START STOP UNIT
command.
not receive a NOTIFY (ENABLE SPINUP) primitive within 5 seconds, the drive fails the START STOP UNIT
command.
The START STOP UNIT command may be used to command the drive to stop the spindle. Stop time is 20 sec-
onds (maximum) from removal of DC power. SCSI stop time is 20 seconds. There is no power control switch
on the drive.
onds (maximum) from removal of DC power. SCSI stop time is 20 seconds. There is no power control switch
on the drive.