Seagate ST3146755SS, ST3300555SS Reliability, Formatted capacities, Programmable drive capacity

3.4Reliability

•1,400,000 hour MTBF (Annualized Failure Rate (AFR) of 0.62%)

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

•5-year warranty

3.5Formatted 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)

	ST3300555SS		ST3146755SS		ST373355SS
Sector Size	Decimal	Hex	Decimal	Hex	Decimal	Hex
512	585,937,500	22ECB25C	286,749,488	11177330	143,374,744	88BB998
520	573,653,847	22314357	280,790,184	10BC84A8	140,395,092	85E4254
524	566,007,800	21BC97F8	275,154,368	106685C0	137,577,184	83342E0
528	557,874,778	21407E5A	272,662,935	10408197	136,331,467	82040CB

2.Seagate drives also may be used at the maximum available capacity at a given block size, but the excess capacity above the guaranteed level will vary between other drive families and from generation to genera- tion, depending on how each block 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.

3.6Programmable 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.

3.7Factory-installed accessories

OEM standard drives are shipped with the Cheetah T10 SAS Installation Guide, part number 100433695, and the Safety and Regulatory Agency Specifications, part number 75789512 (unless otherwise specified).

Cheetah T10 SAS Product Manual, Rev. A 9