Seagate ST9450304SS, ST9600204SS, ST9600104SS Start/stop time, General performance characteristics

4.2.2Format command execution time for 512-byte sectors (minutes)

	ST9600204SS	ST9450404SS
	ST9600104SS	ST9450304SS
Maximum (with verify)	184	136
Maximum (without verify)	92	68

Note. There is no significant difference in the format time between SED and non-SED models of the same capacity.

4.2.3General performance characteristics

Minimum sector interleave	1 to 1
Data buffer to/from disc media (one 512-byte logical block)*	72 to 135 MB/s
Sustained transfer rate	72 to 135 MB/s
SAS Interface maximum instantaneous transfer rate	600 MB/s* per port
	(dual port = 1200 MB/s*)
Logical block sizes
512 (default), 520, 524 or 528.
Read/write consecutive sectors on a track	Yes
Flaw reallocation performance impact (for flaws reallocated at format time using the	Negligible
spare sectors per sparing zone reallocation scheme.)
Average rotational latency	3.0ms

*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the host.

4.3Start/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 20 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.

10 Savvio 10K.4 SAS Product Manual, Rev. A