4.2Media description
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection.
4.3Performance
•Programmable
•400 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
Note. There is no significant performance difference between
4.4Reliability
•Annualized Failure Rate (AFR) of 0.55%
•Increased LSI circuitry integration
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•Dithering
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4.5Formatted capacities
Standard OEM models are formatted to 512 bytes per block. The block size is selectable at format time and must be one of the supported sizes listed in the table below.
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:
| ST3600057FC |
| ST3450857FC |
| ST3300657FC |
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| ST3600957FC |
| ST3450757FC |
| ST3300557FC |
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| ST3600857FC |
| ST3450657FC |
| ST3300457FC |
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Sector Size | Decimal | Hex | Decimal | Hex | Decimal | Hex |
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512 | 1,172,123,568 | 45DD2FB0 | 879,097,968 | 3465F870 | 585,937,500 | 22ECB25C |
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520 | 1,147,307,694 | 446286AE | 860,480,771 | 3349E503 | 573,653,848 | 22314358 |
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524 | 1,132,015,600 | 43792FF0 | 849,011,700 | 329AE3F4 | 566,007,800 | 21BC97F8 |
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528 | 1,115,749,560 | 4280FCB8 | 836,812,167 | 31E0BD87 | 557,874,778 | 21407E5A |
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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 generation, 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 forward compatibility takes precedence.
8 | Cheetah 15K.7 FC Product Manual, Rev. C |
