User Manual

Constellation.2 SAS Product Manual, Rev. K 17
4.2.2 Format command execution time for 512-byte sectors (minutes)
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Sta-
tus Byte Transfer to the Initiator (excluding connect/disconnect).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
4.2.3 General performance characteristics
4.3 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 20 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 opera-
tions 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 seconds
(maximum) from removal of DC power. SCSI stop time is 20 seconds. There is no power control switch on the drive.
1TB models 500GB models
Maximum (with verify)
384 188
Maximum (without verify)
192 94
Minimum sector interleave 1 to 1
Internal data transfer rate 1320 Mb/s
Sustained transfer rate 57 to 115 MB/s
SAS Interface maximum instantaneous transfer rate 600 MB/s* per port
(dual port = 1200 MB/s*)
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.)
Negligible
Average rotational latency 4.16ms
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the
host.