Conducted Noise; Voltage Tolerance; Figure 2. Typical 12V Startup And Operation Current Profile - Seagate ST31000340NS Product Manual

Figure 2. Typical 12V startup and operation current profile

2.8.2

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 voltage by the typical RMS read/write
current.
2.8.3

Voltage tolerance

Voltage tolerance (including noise):
5V +10% / -7.5%
12V +10% / -7.5%
Barracuda ES.2 Serial ATA Product Manual, Rev. A 13