Seagate ST3320311CS, ST3250312CS Typical current profiles, Conducted noise, Voltage tolerance

2.8.1.1Typical current profiles

Figure 1. Typical 12V startup and operation current profile

2.8.2Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the 12V line or an equivalent 15-ohm resistive load on the 5V line.

•Using 12V power, the drive is expected to operate with a maximum of 120mV peak-to-peak square-wave injected noise at up to 10MHz.

•Using 5V power, the drive is expected to operate with a maximum of 100mV peak-to-peak square-wave injected noise at up to 10MHz.

Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.

2.8.3Voltage tolerance

Voltage tolerance (including noise):

•5V ± 5%

•12V ± 10%

Video 3.5 HDD Product Manual, Rev. J 13