Seagate ST9500432SS Performance, Reliability, Formatted capacities, Programmable drive capacity

4.3Performance

•Programmable multi-segmentable cache buffer

•600 Mbytes/sec maximum instantaneous data transfers.

•7200 RPM spindle. Average latency = 4.16 msec

•Background processing of queue

•Supports start and stop commands (spindle stops spinning)

•Adaptive seek velocity; improved seek performance

Note. There is no significant performance difference between Self-Encrypting Drive and standard (non- Self-Encrypting Drive) models.

4.4Reliability

•Annualized Failure Rate (AFR) of 0.73%

•Mean time between failures (MTBF) of 1,200,000 hours

•Balanced low mass rotary voice coil actuator

•Incorporates industry-standard Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)

•5-year warranty

4.5Formatted capacities

Standard OEM models are formatted to 512 bytes per block. The block size is selectable at format time and must be a multiple of 4 bytes. Users having the necessary equipment may modify the data block size before issuing a format command and obtain different formatted capacities than those listed.

To provide a stable target capacity environment and at the same time provide users with flexibility if they choose, Seagate recommends product planning in one of two modes:

1.Seagate designs specify capacity points at certain block sizes that Seagate guarantees current and future products will meet. We recommend customers use this capacity in their project planning, as it ensures a stable operating point with backward and forward compatibility from generation to generation. The current guaranteed operating points for this product are:

Capacity (Blocks)

	ST9500430SS, ST9500431SS & ST9500432SS
Sector Size	Decimal	Hex
512	976,773,168	3A386030
520	961,538,465	394FE9A1
528	938,165,665	37EB45A1

4.6Programmable drive capacity

Using the Mode Select command, the drive can change its capacity to something less than maximum. See the Mode Select (6) parameter list table in the SAS Interface Manual, part number 100293071. A value of zero in the Number of Blocks field indicates that the drive will not change the capacity it is currently formatted to have. A number other than zero and less than the maximum number of LBAs in the Number of Blocks field changes the total drive capacity to the value in the Number of Blocks field. A value greater than the maximum number of LBAs is rounded down to the maximum capacity.

8 Constellation SAS Product Manual, Rev. E