Seagate cheetah st3146954fc Manual Do Utilizador
Cheetah 15K.4 FC Product Manual, Rev. B
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.4 FC drives.
Cheetah 15K.4 FC drives.
4.1
Internal drive characteristics
ST3146954FC
ST373554FC
ST336854FC
Drive capacity
146.8
73.4
36.7
Gbytes (formatted, rounded off value)
Read/write data heads
8
4
2
Bytes per track
471,916
471,916
471,916
Bytes (average, rounded off values)
Bytes per surface
18,351
18,351
18,351
Mbytes (unformatted, rounded off value)
Tracks per surface (total)
50,864
50,864
50,864
Tracks (user accessible)
Tracks per inch
85,000
85,000
85,000
TPI
Peak bits per inch
628
628
628
KBPI
Internal data rate
685-1,142
685-1,142
685-1,142
Mbits/sec (variable with zone)
Disc rotation speed
15k
15k
15k
rpm
Avg rotational latency
2.0
2.0
2.0
msec
4.2
Seek performance characteristics
See Section 9.5, "FC-AL physical interface" on page 64 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
77767496) for additional timing details.
4.2.1
Access time
Not including controller overhead
1
,
2
(msec)
1.
Typical access times are measured under nominal conditions of temperature, voltage,
and horizontal orientation as measured on a representative sample of drives.
and horizontal orientation as measured on a representative sample of drives.
2.
Access to data = access time + latency time.
Read
Write
Average
Typical
3.5
4.0
Single track
Typical
0.27
0.45
Full stroke
Typical
7.4
7.9