I have this old external hard drive, 80 GB, nothing too fancy, that is powered entirely by USB. The problem is that it keeps disconnecting itself.
I remember that I tested it with a short cable (15 cm, more or less) and it worked fine.
Now I'm using a one meter cable and it keeps disconnecting. And I can't find short USB cables anywhere!
Could be that the hard drive is not receiving enough power from the USB? It is connected to the back USB ports of a desktop PC, so I didn't think it could be that, but now I have my doubts.