Seagate 810 manual Power recovery, Conducted noise, Voltage tolerance, Power-management modes

Marathon 810 (ST9816AG) Product Manual, August 1995 9

1.7.2Power 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.

1.7.3Conducted 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).

1.7.4Voltage tolerance

Voltage tolerance (including noise): +5 volts + 5% – 10%

1.7.5Power-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