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Seagate Barracuda 5400.1 Manual

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12 Barracuda 5400.1 Product Manual, Rev. C
2.9.2 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.
2.9.3 Voltage tolerance
Voltage tolerance (including noise):
2.9.4 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:
• 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.
• Standby mode
The drive enters Standby mode when the host sends a Standby Immediate
command. If the host has set the standby timer, the drive can also enter
5V ± 5%
12V ± 10%
Power modes Heads Spindle Buffer
Active Tracking Rotating Enabled
Idle Tracking Rotating Enabled
Standby Parked Stopped Enabled
Sleep Parked Stopped Disabled
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