Seagate Cheetah 18FC ST118202FC, Руководство по эксплуатации продукта

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Cheetah 18FC Product Manual, Rev. C 9
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 18FC drives.
4.1 Internal drive characteristics
ST118202FC
Drive capacity 22.54 ........................ Gbytes (unformatted)
18.2 .......................... Gbytes (formatted with 512-byte logical blocks)
Read/write data heads 24
Bytes per track 104,840 - 159,008 .... Bytes (average, unformatted)
Bytes per surface 939 ........................... Mbytes (unformatted)
Cylinders/tracks per surface 6,962 ........................ Tracks (user accessible)
Tracks per inch 8,962 ........................ TPI
Internal data rate 152-231 .................... Mbits/sec (variable with zone)
Disc rotation speed 10,025 ...................... rpm (+ 0.5%)
Avg rotational latency 2.99 .......................... msec
4.2 Seek performance characteristics
See Section 9.5, “FC-AL physical interface” on page 46 and the
Fibre Channel Interface Manual
(part number
77767496) for additional timing details.
4.2.1 Access time
4.2.2 Format command execution time for
≥
512-byte sectors
Including controller overhead
1
,
2
(msec)
1. Execution time measured from receipt of the command to the FCP Response.
2. Assumes no errors and no sector has been relocated.
Read Write
Average Typical
3
,
4
3. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as
measured on a representative sample of drives.
4. Access time = controller ov average seek time.
Access to data = controller ov average seek time + latency time.
6.0 6.8
Single track Typical
3,4
0.8 1.1
Full stroke Typical
3,4
<12.2 <13.2
ST118202FC
Maximum (with verify) 60 minutes
Maximum (without verify) 30 minutes