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

10 Barracuda ATA III Family Product Manual, Rev. B

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%
12V 10%

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.
0.7 amps max
2.2 amps max
Spindle
Rotating
Rotating
Stopped
Stopped
Buffer
Enabled
Enabled
Enabled
Disabled