Seagate ST32122A - Medalist 2.1 GB Hard Drive, Руководство по эксплуатации продукта

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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 triangular-wave injected noise at up to 25
MHz.
•
Using 5-volt power, the drive is expected to operate with a maximum
of 100 mV peak-to-peak triangular-wave injected noise at up to 25
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
These drives provide programmable power management to provide
greater energy efficiency. In most systems, you can control power
management through the system setup program. These Seagate drives
feature several power-management modes, which are summarized in
the following table and described in more detail below:
Mode Heads Spindle Buffer
Active Moving Rotating Enabled
Idle Moving Rotating Enabled
Standby Parked Stopped Enabled
Sleep Parked Stopped Disabled
Active mode. The drive is in Active mode during the read/write and seek
operations.
Idle mode. The spindle remains up to speed. 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 Standby mode automatically after the drive has been
inactive for a specifiable length of time. In Standby mode, the buffer remains
Medalist 4342, 3232, 2122, 1722 and 1012 Product Manual 11