don2 Posted October 9, 2013 Share Posted October 9, 2013 What is power type external hard disk?what is power less external hard disk?please explain in detail !!! Quote Link to comment Share on other sites More sharing options...
alaindc Posted October 9, 2013 Share Posted October 9, 2013 I will try.A portable hardrive is USB powered, and don't need external power source (only usb).You connect the Usb cord, and that's it.you can use it anywhere.this one is probably the power less HD you talk about.An external hardrive...have a power adaptor you need to connect, plus the USB cord.you plug the AC adaptor, then the usb cord, for it to work.if you can't connect the AC adaptor, it won't work, at all. Quote Link to comment Share on other sites More sharing options...
Whoopenstein Posted October 10, 2013 Share Posted October 10, 2013 The one I have uses a power supply similar what is used on a laptop. I would be concerned if the drive (desktop size) sucked that much current from just the USB. Quote Link to comment Share on other sites More sharing options...
GRiM Posted October 10, 2013 Share Posted October 10, 2013 Generally it depends on size of drive. For example a 2.5" (laptop internal hdd) external can use the 5v USB power output. A 3.5" (desktop internal) external drive will need additional power source. Quote Link to comment Share on other sites More sharing options...
Guinness Posted October 10, 2013 Share Posted October 10, 2013 (edited) Yep, 3,5´ E-Hdd´s need both 5V and 12V to operate, and generally requires about 20 Watts to startup, so a separate power brick is needed. 2,5´ E-Hdd´s requires only 5V, generally about 500mA (using one USB 2.0 port) or 1A (using two USB 2.0 ports) so you can use them via USB 2.0 5V Bus-Power. Edited October 10, 2013 by Guinness Quote Link to comment Share on other sites More sharing options...
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