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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 instant
aneous 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
sp
are 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.
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.
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).
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).
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.
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.