Seagate ST91000642NS User Manual
10
Constellation.2 Serial ATA Product Manual, Rev. B
Table 2:
1000GB drive (Standard & SED model)
DC power requirementss
Parameter
Voltage
+5 V
+12 V Power
+5 V
+12 V Power
Regulation
(watts)
(watts)
Average Idle Current
0.27
0.16
3.27
0.27
0.16
3.31
Advanced Idle Current
Idle1
Idle1
0.22
0.16
3.07
0.23
0.16
3.10
Idle2
0.15
0.13
2.33
0.16
0.13
2.36
Idle3
0.15
0.09
1.86
0.16
0.09
1.89
Standby
0.14
0.04
1.16
0.14
0.04
1.19
Average Sleep Current
0.14
0.04
1.15
0.14
0.04
1.20
Maximum Start Current:
DC (Peak DC)
DC (Peak DC)
0.51
0.99
14.43
0.52
0.99
14.50
AC (Peak AC)
0.72
1.37
19.99
0.66
1.36
19.61
Delayed Motor Start (DC max)
0.14
0.04
1.18
0.15
0.04
1.23
Peak Operating Current (random read):
Typical DC
Typical DC
0.29
0.32
5.26
0.31
0.31
5.21
Maximum DC
0.32
0.33
5.56
0.34
0.33
5.65
Maximum DC (peak)
1.02
0.90
15.90
1.00
0.88
15.56
Peak Operating Current (random write):
Typical DC
Typical DC
0.38
0.27
5.19
0.39
0.27
5.19
Maximum DC
0.40
0.28
5.40
0.41
0.28
5.46
Maximum DC (peak)
0.96
0.90
15.60
0.96
0.90
15.60
Peak operating current (sequential read):
Typical DC
Typical DC
0.61
0.18
5.19
0.62
0.18
5.24
Maximum DC
0.64
0.19
5.42
0.65
0.18
5.45
Maximum DC (peak)
0.82
0.36
8.42
0.84
0.36
8.52
Peak operating current (sequential write):
Typical DC
Typical DC
0.76
0.18
5.93
0.76
0.18
5.95
Maximum DC
0.79
0.19
6.16
0.80
0.19
6.22
Maximum DC (peak)
0.98
0.34
8.98
0.98
0.36
9.22
ST91000640NS
ST91000640NS
(3.0GB)
(6.0GB)
+10/-7.5%
+10/-7.5%
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.
power to operational levels.