I am planning to use this with a digital music player whose USB ports only provide 500mA of current. How much current does this SSD need? What about the 1TB version?

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According to Samsung, this type of SSD consumes a maximum of 3.5 watts. Knowing that the USB port provides 5V and that the current is continuous and that P=U x I We have therefore that I=P/U is I=3.5/5=0.7 [A] or 700 [mA].
So the answer is a priori no. But, if the disk support has a double USB plug (one of which is for current only), then it works.

http://www.samsung.com/fr/memory-storage/850-evo-sata-3-2-5-inch-ssd/MZ-75E500BEU/

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Question about Samsung 850 EVO Basic

I am planning to use this with a digital music player whose USB ports only provide 500mA of current. How much current does this SSD need? What about the 1TB version?