Conducted Noise; Voltage Tolerance; Power-Management Modes; Figure 2. Typical 12V Startup And Operation Current Profile - Seagate DB35.3 Series Serial ATA 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 ± 5%
12V ± 10%
2.8.4

Power-management modes

The drive provides programmable power management to provide greater energy efficiency. In most systems,
you can control power management through the system setup program. The drive features the following
power-management modes:
Power modes Heads
Active Tracking
Idle Tracking
Standby Parked
Sleep Parked
• Active mode
The drive is in Active mode during the read/write and seek operations.
16
Spindle Buffer
Rotating Enabled
Rotating Enabled
Stopped Enabled
Stopped Disabled
DB35.3 Series Serial ATA Product Manual, Rev. D