For point of power reference in relation to drive usage, my Seagate SATAs say maximum spin-up draw is 2.8 amp @ 12 volt, so roughly 11 amp if all four are spun up at once, 14 if the fifth drive is assumed to have similar power requirements. Operational draw is of course much lower, .85 amp on the 5 volt, .79 amp on the 12 volt, according to specs, so 4.3 amp 5 volt, 4 amp 12 volt draw, five disk operational. Say 5 amp total for each voltage, 5 and 12.
Yes, although that a lot of factory default settings for scsi hard drives have a Delayed start option of 10s * scsi ID and / or until the start command is received so that the power supply doesn't get hammered.
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