Performance Characteristics; Internal Drive Characteristics; Seek Performance Characteristics; Access Time - Seagate Cheetah 15K.6 FC ST3146356FC Product Manual

4.0

Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.6 FC drives.
4.1

Internal drive characteristics

Drive capacity*
Read/write data heads
Tracks per inch
Peak bits per inch
Areal density
Internal data rate
Disc 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.
4.2

Seek performance characteristics

See Section 9.5, "FC-AL physical interface" on page 68 and the Fibre Channel Interface Manual (part number
77767496) for additional timing details.
4.2.1

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 FC Product Manual, Rev. C
ST3450856FC ST3300656FC
ST3450056FC ST3300056FC
450 300
8 6
150,000 150,000
1,100k 1,100k
165 165
1.95 1.95
15k 15k
2.0 2.0
Not including controller overhead
Read
3.4
0.20
6.6
ST3146356FC
ST3146756FC
146 Gbytes (formatted, rounded off value)
3
150,000 TPI
1,100k BPI
165 Gbits/inch
1.95 Gbits/sec (max)
15k rpm
2.0 msec
1 2
,
(msec)
Write
3.9
0.44
7.4
2
11