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1.7.2 Power recovery
Except during execution of a write command, the drive’s power can be
interrupted without adversely affecting the drive or previously written
data. If power is removed while the drive is performing a write operation,
the integrity of the data being written cannot be guaranteed.
1.7.3 Conducted noise
The drive is expected to operate with a maximum of:
• 150 mV peak-to-peak triangular-wave injected noise at the power
connector. The frequency is 10 Hz to 100 KHz with equivalent resistive
loads.
• 100 mV peak-to-peak triangular-wave injected noise at the power
connector. The frequency is 100 KHz to 10 MHz with equivalent
resistive loads.
Note. Equivalent resistance (11.9 ohms) is calculated by dividing the
nominal voltage (5.0V) by the typical RMS read/write current
(0.420 amps).
1.7.4 Voltage tolerance
Voltage tolerance (including noise): +5 volts + 5% – 10%
1.7.5 Power-management modes
Power management is required for low-power and portable computer
systems. In most systems, you can control power management through
the system setup program. This Seagate
®
drive features several power-
management modes, which are described briefly below:
Active mode. The drive is in Active mode during the read/write and seek
operations.
Idle mode. At power-on, the drive sets the idle timer to enter Idle mode
after 5 seconds of inactivity. You can set the idle timer delay using the
system setup utility. In Idle mode, the spindle remains up to speed. The
heads are parked away from the data zones for maximum data safety.
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 standby timer has been set by the host
system, the drive can also enter Standby mode automatically after the drive
has been inactive for a specifiable length of time. The standby timer delay
Marathon 810 (ST9816AG) Product Manual, August 1995 9