Seagate ST936751SS ユーザーズマニュアル
Savvio 15K SAS Product Manual, Rev. B
11
4.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
vio drives.
4.1
Internal drive characteristics
ST973451SS
ST936751SS
Drive capacity
73.4
36.7
Gbytes (formatted, rounded off value)
Read/write data heads
4
2
Tracks per surface (total)
42,554
42,554
Tracks (user accessible including spare tracks)
Tracks per inch
150
150
kTPI (average)
Peak bits per inch
861.81
861.81
kBPI
Areal density
130.58
130.58
Gbit/in
2
Internal data rate
957.51 to 1,282.08
957.51 to 1,282.08
Mbits/sec (variable with zone)
Disc rotation speed
15k
15k
rpm
Avg rotational latency
2
2
msec
4.2
Seek performance characteristics
See Section 9.4.1, "SAS physical interface" on page 54 and the SAS Interface Manual (part number
100293071) for additional timing details.
100293071) for additional timing details.
4.2.1
Access time (Gen 2.0 LP data)
Not including controller overhead (msec)
Read
Write
Average
Typical
1
,
2
1.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as
measured on a representative sample of drives.
measured on a representative sample of drives.
2.
Access to data = access time + latency time.
2.9
3.3
Single track
Typical
1,2
0.2
0.4
Full stroke
Typical
1,2
5.1
5.5