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5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.6 drives.
5.1
Internal drive characteristics
Drive capacity
Read/write data heads
Tracks per inch
Peak bits per inch
Areal Density
Internal data rate
disk rotation speed
Avg rotational latency
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
5.2
Seek time
See Section 10.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number
100293071) for additional timing details.
5.2.1
Access time
Average
Typical
Single track
Typical
Full stroke
Typical
1.
Typical access times are measured under nominal conditions of temperature, voltage, and
horizontal orientation as measured on a representative sample of drives.
2.
Access to data = access time + latency time.
Cheetah 15K.6 SAS Product Manual, Rev. C
ST3450856SS
ST3300656SS ST3146356SS
ST3450056SS
ST3300056SS ST3146756SS
450
300
8
6
150,000
150,000
1,100
1,100
165
165
1.95
1.95
15k
15k
2.0
2.0
Not Including controller overhead
Read
3.4
0.20
6.43
146
Gbytes (formatted, rounded off value)
3
150,000
TPI
1,100
KBPI
165
Gbits/inch
1.95
Gbits/sec (max)
15k
RPM
2.0
msec
1
2
,
(msec)
Write
3.9
0.44
7.12
2
*
9
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