11/12/2022 0 Comments Usb to ide sata cable adaptor power![]() Inside the external usb enclosure are electronics that convert AC power to DC. Some external drives use an AC adaptor, some DC. The drives themselves require DC regulated power. It's not related to either AC or DC power. (NOTE: any modding or custom wiring is done at your own risk) Even if the labeled power consumption refers to the peak power requirements during spinup (rather than typical power requirements), we'll definitely need at least 5 USB 2.0 headers or 3 USB 3.0 headers to fully power the drive. This particular drive also requires 5V, 0.85A-which could be taken partially from the leftover power supplied by the first few USB headers. Assuming perfect power conversion efficiency, that means stepping up the voltage from at least 3 USB 2.0 headers (5V * 0.5A * 3 = 7.5W) or 2 USB 3.0 headers (5V * 0.9A * 2 = 9W). A drive on my desk right now is labeled 12V, 0.5A (i.e., 6W). As others have noted, any random consumer 3.5" drive might require 13W to initially spin up the hard drive.
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