Nothing bad happened, fortunately, but I'd like to know if instant shutdown is an expected and planned reaction of hardware pieces, or just the motherboard (or PSU) freaking out and disabling everything unexpectedly. Is there some signal that hard drives send when they think they're not getting enough power? Or does each individual hardware piece ask the PSU if it can provide it X watts of power, and it may say "no, I don't have that available"? Does the motherboard decide if it can negotiate this power request and safely avoid sudden power loss and instant shutdown? Or is the standard protocol in this case to drop dead without trying to avoid this problem?įrom my experience with my desktop and a few hard drives and a low power 350W PSU, it would instantly shut down if 5 hard drives were all trying to spin up at the same time. What happens when, for example, you have 100 hard drives installed in a desktop tower (or a server rack) with let's say 1000 watt PSU, and they're all on standby, and then suddenly some process accesses all of the hard drives and spins them up, drawing more power than PSU can give? There are times when hard drives are on standby and not using as much as when they're spinning and graphics cards save power when not fully utilized.
As far as I understand, computers don't always draw the same amount of power from the power supply all the time.
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