Performance Characteristics; Internal Drive Characteristics; Seek Performance; Access Time - Seagate Cheetah NS 10K Product Manual

4.0

Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of
Cheetah NS SAS drives.
4.1

Internal drive characteristics

Drive capacity
Read/write data heads
Tracks per surface (total)
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.
4.2

Seek performance

See Section 9.4.1, "SAS physical interface" on page 51 and the SAS Interface Manual (part number
100293071) 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 NS SAS Product Manual, Rev. A
ST3400755SS
400.0 Gbytes (formatted, rounded off value)
8
92,200 Tracks (user accessible)
155,000 TPI
979k BPI
151.7 Gbits/inch
725 to 1,211 Mbits/sec (variable with zone)
10k rpm
2.98 msec
Not Including controller overhead
Read
3.9
0.35
6.8
2
1 2
,
(msec)
Write
4.2
0.52
7.5
*
11