USB can not provide enough power for these. Both however are fed with +5 volt and +12 volt. a 15K RPM SAS drive is likely to use a lot more power then a 5400RPM drive. ![]() Depending on how much more power can be delivered this might be granted or not.įor USB 1 and USB 2 this is maximum 500mA at 5 volt (max 5 Watt).įor USB 3 this can be up to 900mA at 5 volt.Ī typical 3½ desktop drive uses up to 15 Watt at start up, and about 5 to 10 Watt when mostly idle. If a device on the USB bus needs more power it needs to ask for it. This is supposed to be just enough to power some electric circuitry. ![]() USB provides minimal power on the USB bus. Let me give a proper long answer on this (rather than the comment from earlier).
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