Seagate ST9900805SS Savvio 10K.1 FC Product Manual - Page 15

3.4 Reliability • Mean Time Betwen Failures (MTBF) of 1,400,000 hours. • LSI circuitry • Balanced low mass rotary voice coil actuator • 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. Note. For 2 gigabit operation, sector sizes must be divisible by 8. 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 512 514 520 522 524 ST936701 Decimal 71,687,372 70,512,692 70,197,546 68,914,176 68,766,592 Hex 445DCCC 433F034 42F212A 41B8C00 4194B80 ST973401 Decimal 143,374,744 141,025,384 140,395,092 137,828,352 137,577,184 Hex 88BB998 867E068 85E4254 8371800 83342E0 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 other drive 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 (6) parameter list table in the Fibre Channel Interface Manual, part number 7767496. 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 change the capacity it is currently formatted to have. A number in the number of blocks field that is less than the maximum number of LBAs changes the total drive capacity to the value in the block descriptor number of blocks field. A value greater than the maximum number of LBAs is rounded down to the maximum capacity. Savvio FC Product Manual, Rev. D 9