Seagate ST3146855LC, ST3146855LW, ST3300655LW manual Performance, Reliability, Formatted capacities

4.3Performance

•Supports industry standard Ultra320 SCSI interface

•Programmable multi-segmentable cache buffer (see Section 5.5)

•15k RPM spindle. Average latency = 2.0 msec

•Command queuing of up to 64 commands

•Background processing of queue

•Supports start and stop commands (spindle stops spinning)

4.4Reliability

•Annualized Failure Rate (AFR) of 0.62%

•Increased LSI circuitry integration

•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 sector size is selectable at format time. 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 sector 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:

	ST3300655LW		ST3146855LW		ST373455LW
	ST3300655LC		ST3146855LC		ST373455LC
Sector Size	Decimal	Hex	Decimal	Hex	Decimal	Hex
512	585,937,500	22ECB25C	286,749,488	11177330	143,374,744	88BB998
514	574,712,644	22416B44	282,050,768	10CFC0D0	141,025,384	867E068
520	573,653,847	22314357	280,790,184	10BC84A8	140,395,092	85E4254
522	570,053,000	21FA5188	279,041,740	10A1D6CC	139,463,602	8500BB2
524	566,007,800	21BC97F8	275,154,368	106685C0	137,577,184	83342E0
528	557,874,778	21407E5A	272,662,935	10408197h	136,331,467	82040CBh

2.Seagate drives also may be used at the maximum available capacity at a given sector size, but the excess capacity above the guaranteed level will vary between 10K and 15K families and from generation to gener- ation, depending on how each sector size actually formats out for zone frequencies and splits over servo bursts. This added capacity potential may range from 0.1 to 1.3 percent above the guaranteed capacities listed above. Using the drives in this manner gives the absolute maximum capacity potential, but the user must determine if the extra capacity potential is useful, or whether their assurance of backward and for- ward compatibility takes precedence.

8 Cheetah 15K.5 SCSI Product Manual, Rev. J