Power Requirements; Power Consumption; Dc Voltage Tolerances - Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB Product Manual

4.5.3 Power Requirements

This section lists the various power specifications for the Quantum Atlas 10K II
Ultra 160/m SCSI hard disk drives.

4.5.3.1 Power Consumption

Startup (Peak)
40% Seek (ECMA)
Idle
* Quantum Corporation's startup peak current measurements are based on a
2.5 ms sampling rate. The industry typical sampling rate is 20ms and,
therefore, the Quantum stated startup peak power data appear to be higher
than the industry typical numbers.
ECMA Seek Rate is defined in ECMA standard 74. It corresponds to 52
random seeks per second.

4.5.3.2 DC Voltage Tolerances

Nominal Voltage
5 Vdc Supply
12 Vdc Supply
Polarity must not be reversed at any time. Reversing polarity at any time on
either power line may damage components. Voltage is measured at the drive
power connector.
Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
Maximum Watts
9.2 GB 18.4 GB
38.8 W* 38.8 W*
15.0 W 15.0 W
8.6 W 8.6 W
NOTE
Voltage Tolerance
5%
5% ( 6% transient during spin-up)
CAUTION
Specifications
36.7 GB 73.4 GB
38.8 W* 47.6 W*
16.7 W 20.7 W
9.9 W 14.7 W
Absolute Limits
4.75 - 5.25 Vdc
11.4 - 12.6 Vdc
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