Conducted Noise; Voltage Tolerance; Figure 1. Typical Startup And Operation Current Profile - Seagate ST34321A Product Manual

10 Medalist 8641, 6531, 4321, 3221 and 2110, Rev. B
1.7.1.1 Typical current profile
Figure 1 shows a typical current profile
Current (Amps)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 1 2

Figure 1. Typical startup and operation current profile

1.7.2 Conducted noise

Input noise ripple is measured at the host system power supply across
an equivalent 80-ohm resistive load on the +12 volt line or an equivalent
15-ohm resistive load on the +5 volt line.
Using 12-volt power, the drive is expected to operate with a maximum
of 120 mV peak-to-peak square-wave injected noise at up to 10 MHz.
Using 5-volt power, the drive is expected to operate with a maximum
of 100 mV peak-to-peak square-wave injected noise at up to 10 MHz.
Note. Equivalent resistance is calculated by dividing the nominal volt-
age by the typical RMS read/write current.

1.7.3 Voltage tolerance

Voltage tolerance (including noise): 5V
3 4 5 6
Time (seconds)
5% and 12V
7 8 9
8