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8
Marathon 810 (ST9816AG) Product Manual, August 1995
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.
Typical watts RMS
Mode
(at nominal voltage)
Spinup
3.50
Active
Seeking
2.10
Read/Write
2.10
Idle
1.30
Standby
0.40
Sleep
0.30
1.7.1.1
Typical current profile
Figure 1 shows a typical current profile for the ST9816AG.
Current (Amps)
1.6
Spinup
1.4
Drive ready
1.2
1.0
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0.8
0.6
0.4
0.2
0.0
0
1
2
3
4
Figure 1. Typical startup and operation current profile for the ST9816AG
Typical amps RMS
(at nominal voltage)
0.700
0.420
0.420
0.260
0.080
0.060
Idle
Active
mode
mode
5
5
6
7
8
9
Time (seconds)
Standby
Sleep
mode
mode
10
11
12
13
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