Seagate ST3300056SS (FDE) ユーザーズマニュアル
Cheetah 15K.6 SAS Product Manual, Rev. B
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.6 drives.
Cheetah 15K.6 drives.
4.1
Internal drive characteristics
ST3450856SS
ST3300656SS ST3146356SS
ST3450056SS
ST3300056SS ST3146756SS
Drive capacity
450
300
146
Gbytes (formatted, rounded off value)
*
Read/write data heads
8
6
3
Tracks per inch
150,000
150,000
150,000
TPI
Peak bits per inch
1,100
1,100
1,100
KBPI
Areal Density
165
165
165
Gbits/inch
2
Internal data rate
1.95
1.95
1.95
Gbits/sec (max)
disk rotation speed
15k
15k
15k
RPM
Avg rotational latency
2.0
2.0
2.0
msec
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
4.2
Seek time
See Section 9.4.1, "SAS physical interface" on page 62 and the SAS Interface Manual (part number
100293071) for additional timing details.
100293071) 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.
horizontal orientation as measured on a representative sample of drives.
2.
Access to data = access time + latency time.
Read
Write
Average
Typical
3.4
3.9
Single track
Typical
0.20
0.44
Full stroke
Typical
6.43
7.12