Seagate Comprehensive Guide for Drive ST9450404SS: Performance and Reliability Insights

4.3Performance

•Programmable multi-segmentable cache buffer

•600MB/s maximum instantaneous data transfers.

•10K RPM spindle. Average latency = 3.0ms

•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 0.44%

•Mean time between failures (MTBF) of 2,000,000 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:

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 shown below.

Capacity (Blocks)

	ST9600204SS		ST9450404SS
	ST9600104SS		ST9450304SS
	ST9600004SS		ST9450204SS
Sector Size	Decimal	Hex	Decimal	Hex
512	1,172,123,568	45DD2FB0h	879,097,968	3465F870h
520	1,147,307,696	446286B0h	860,480,776	3349E508h
524	1,132,015,600	43792FF0h	849,011,704	329AE3F8h
528	1,115,749,560	4280FCB8h	836,812,168	31E0BD88h

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