Filter
Top Products
Constellation ES.2 SAS Product Manual, Rev. C 11
5.2.2 Format command execution time for 512-byte sectors (minutes)
ST33000650SS
ST33
000651SS
ST33000652SS
Maximum (with verify)
827
Maximum (without verify)
402
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 disk media (one 512-byte logical block)* 113 to 239 MB/s
Sustained transfer rate 68.7 to 155 MB/s
SAS Interface maximum instant
aneous transfer rate 600MB/s* per port
(dual port = 1200MB/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
sp
are 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.
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
seconds (maximum) from removal of DC power. SCSI stop time is 20 seconds. There is no power control
switch on the drive.