Seagate MARATHON 1680, Product Manual

Page: 17 / 48

1.7.1.1 Typical current profile
Figure 1 shows a projected drive startup and operation current profile for
the Marathon 2250 and the Marathon 1680.
Note. The peaks in Figure 1 are the result of inductive kickback from
the commutation of the spindle motor and, therefore, do not draw
power from the battery.
1.7.2 Power recovery
Except during execution of a write command or writing cached data, the
drive’s power can be interrupted without adversely affecting the drive or
previously written data. If power is removed while the drive is performing a
write operation, the integrity of the data being written cannot be guaranteed.
Note. Do not remove power from the drive while the interface signals are ac-
tive (at low impedance) because power may enter the input buffers.
1.7.3 Conducted noise
The drive is expected to operate with a maximum of:
•
150 mV peak-to-peak triangular-wave injected noise at the power
connector. The frequency is 10 Hz to 100 KHz with equivalent resistive
loads.
0
200
400
600
800
1,000
1,200
1,400
0 1 2 3 4 5 5 6 7 8 9 10 11 12
Spinup
Upload code
Drive ready
Idle
Standby
mode
mode
Sleep
mode
Active
mode
Current (mA)
Time (seconds)
Figure 1. Typical startup and operation current profile
Marathon 2250 and Marathon 1680 Product Manual 9