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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
0123455678910111213
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