Seagate ST3300457FC Cheetah 15K.5 FC Product Manual - Page 17

3.3 Performance • Programmable multi-segmentable cache buffer • 800 Mbytes/sec maximum instantaneous data transfers per port • 15k RPM spindle; average latency = 2.0 msec • Command queuing of up to 128 commands • Background processing of queue • Supports start and stop commands (spindle stops spinning) • Adaptive seek velocity; improved seek performance 3.4 Reliability • Annualized Failure Rate (AFR) of 0.62% • Increased LSI circuitry integration • Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) • Dithering • 5-year warranty 3.5 Formatted 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: Sector Size 512 520 524 528 ST3300655FC Decimal 585,937,500 573,653,847 566,007,800 557,874,778 Hex 22ECB25C 22314357 21BC97F8 21407E5A ST3146855FC Decimal Hex 286,749,488 11177330 280,790,184 10BC84A8 275,154,368 106685C0 272,662,935 10408197 ST373455FC Decimal 143,374,744 140,395,092 137,577,184 136,331,467 Hex 88BB998 85E4254 83342E0 82040CB 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 generation, 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 forward compatibility takes precedence. 3.5.1 Programmable drive capacity Using the Mode Select command, the drive can change its capacity to something less than maximum. See the Mode Select Parameter List table in the SCSI Commands Reference Manual. Refer to the Parameter list block descriptor number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not Cheetah 15K.5 FC Product Manual, Rev. F 9