I've already pointed out in a previous post that the USB external I have, uses a split USB cable with 2 plugs to draw sufficient power from 2 ports.Yeah, yeah, I know, but I'm first assuming the HDD is OK and something else mustn't be working properly. A user said the 700mA is may be the reason, I don't know, I have to test it.
Nevertheless, I've put in that very same enclosure, same IC a HDD of 5V and 1.0A and it works fine. So now I'm confused again. How can the HDD of 1.0A run in a USB2.0 enclosure?
Supposedly, USB2.0 can only give 500mA.
The problem is probably as simple as you using the wrong USB cable.