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Power requirements
The voltage and current requirements for a single drive at cylinder 0 are shown
in Table 3.
Table 3. Single drive voltage and current requirements
Current without Internal Current with Internal
Terminator Terminator
Seeking Contin- Seeking Contin-
and uous and uous
Voltage Idle Reading Reading Idle Reading Reading
SCSI single-ended interface
+5 V 1.87A 1.91 A 2.00A 1.90A 1.96A 2.09 A
+12V 1.57A 1.92 A 1.56A 1.57A 1.90A 1.56 A
Watts 28.19W 32.59 W 28.72W 28.34W 32.60 W 29.17W
SCSI differential interface
+5 V 2.32A 2.63 A 2.75A 2.45A 2.77A 2.85 A
+12V 1.63A 1.88 A 1.64A 1.63A 1.88A 1.66 A
Watts 31.21W 35.71 W 33.40W 31.81W 36.41 W 34.17W
Without Internal With Internal
Terminator Terminator
Maximum Current Limits +5 V +12 V +5 V +12 V
SCSI single-ended interface
Maximum operating current* 2.06A 3.09A 2.37A 3.04A
Average idle current 1.84A 1.92A 1.96A 1.92A
Maximum starting current* 2.06A 3.98A 2.37A 3.98A
Maximum seek current* 1.89A 2.12A 2.16A 3.19A
SCSI differential interface
Maximum operating current* 2.98A 2.88A 3.48A 3.17A
Average idle current 2.11A 1.85A 2.45A 1.63A
Maximum starting current* 2.98A 3.98A 3.48A 4.60A
Maximum seek current* 2.31A 2.13A 3.48A 3.17A
*Instantaneous +12 V current peaks will exceed these values by up to 0.8 A.