Seagate ST3450856FC, ST3146356FC manual Start/stop time, Prefetch/multi-segmented cache control

4.2.2Format command execution time (minutes)

		ST3450856FC	ST3300656FC	ST3146356FC
Maximum (with verify)		176	144	100
Maximum (without verify)		88	72	50
4.2.3	General performance characteristics
Sustainable disc transfer rate*:
Minimum				112 Mbytes/sec (typical)
Maximum				171 Mbytes/sec (typical)
Fibre Channel Interface maximum instantaneous transfer rate				800 Mbytes/sec* per port
Logical block sizes
Default is 512-byte data blocks
Sector sizes variable to 512, 520, 524 and 528 bytes.
Read/write consecutive sectors on a track				Yes
Flaw reallocation performance impact (for flaws reallocated at format time				Negligible
using the spare sectors per sparing zone reallocation scheme.)
Average rotational latency				2.0 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. 1MB/sec = 1,000,000 bytes/sec

4.3Start/stop time

If the Motor Start option is disabled, the drive becomes ready within 20 seconds after DC power is applied. If a recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and the time to become ready may exceed 20 seconds. During spin up to ready time, the drive responds to some commands over the FC interface in less than 3 seconds after application of power. Stop time is 30 seconds (maximum) from removal of DC power.

If the Motor Start option is enabled, the internal controller accepts the commands listed in the Fibre Channel Interface Manual less than 3 seconds after DC power has been applied. After the Motor Start command has been received, the drive becomes ready for normal operations within 20 seconds (excluding the error recovery procedure). The Motor Start command can also be used to command the drive to stop the spindle.

There is no power control switch on the drive.

4.4Prefetch/multi-segmented cache control

The drive provides a prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. Cache refers to the drive buffer storage space when it is used in cache operations. To select this feature, the host sends the Mode Select command with the proper values in

12 Cheetah 15K.6 FC Product Manual, Rev. A