Conducted Noise; Voltage Tolerance; Power-Management Modes - Seagate Barracuda ATA Series Product Manual

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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 5% 0.7 amps max
12V 10% 2.4 amps max

1.7.4 Power-management modes

The drive provides programmable power management to provide great-
er energy efficiency. In most systems, you can control power manage-
ment 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.
•
Idle mode
The buffer remains enabled, and the drive accepts all commands and
returns to Active mode any time disc access is necessary.
Barracuda ATA Family Product Manual, Rev. B
Spindle
Rotating
Rotating
Stopped
Stopped
Buffer
Enabled
Enabled
Enabled
Disabled