Seagate MARATHON 810, Product Manual

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level. Active mode current and power are measured with a 32-msec delay
between each operation and the drive in default logical geometry.
Seeking power and currents are measured during one-third-stroke buff-
ered seeks. Read/Write power and current are measured with the heads
on track, based on a 16-sector write followed by a 32-msec delay, then
a 16-sector read followed by a 32-msec delay. Spinup power is measured
from time of power-on to time of drive-ready for normal operation.
Mode
Typical watts RMS
(at nominal voltage) Typical amps RMS
(at nominal voltage)
Spinup 3.50 0.700
Active
Seeking
Read/Write 2.10
2.10 0.420
0.420
Idle 1.30 0.260
Standby 0.40 0.080
Sleep 0.30 0.060
1.7.1.1 Typical current profile
Figure 1 shows a typical current profile for the ST9816AG.
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 1 2 3 4 5 5 6 7 8 9 10 11 12 13
Spinup
Upload code
Drive ready
Idle
Standby
mode
mode
Sleep
mode
Active
mode
Current (Amps)
Time (seconds)
Figure 1. Typical startup and operation current profile for the ST9816AG
8 Marathon 810 (ST9816AG) Product Manual, August 1995