Wtf happened to my external harddrive?

Yesterday I borrowed the external harddrive from my dad, because I wanted to dd the Snow Leopard Mac OS X image on it, to install it via usb on my netbook (I have done it before). After I finished dding I connect the external harddrive on my netbook, at first it works. But like 10mins later, it isn't recognized anymore. So I connect it to my arch PC and dmesg shows this:
[  923.363317] hub 7-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
[  926.433352] hub 7-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
[  929.503345] hub 7-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
[  932.573359] hub 7-0:1.0: Cannot enable port 1.  Maybe the USB cable is bad?
[  932.573379] hub 7-0:1.0: unable to enumerate USB device on port 1
I tried many different ports, doesn't work. Other USB devices work just fine.
So wtf happened? is the USB cable really bad? (I can't believe it, because it worked just fine before ...)
Is the harddrive broken? when I connect the power cable to the harddrive and turn it on it still loads up tho.

Did you try the hard on any other PC? Do "fdisk -l" and "lsusb" recognize it?

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