Others are similar, like the power supply unit built-in to some external hard drives, which are required if the device can't draw enough power from the computer over USB.
Ndị ọzọ yiri nke ahụ, dịka ebe a na-enye ike ọkụ na-arụ ọrụ na ụfọdụ ndị na-arụ ọrụ siri ike , nke a chọrọ ma ọ bụrụ na ngwaọrụ ahụ enweghị ike ịdọta ike zuru ezu site na kọmputa na USB .