Seagate ST3146855LW ユーザーズマニュアル
8
Cheetah 15K.5 SCSI Product Manual, Rev. J
4.3
Performance
• 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)
4.4
Reliability
• 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
4.5
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.
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:
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:
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:
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.
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.
Sector Size
ST3300655LW
ST3300655LC
ST3146855LW
ST3146855LC
ST373455LW
ST373455LC
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