Okay, there is no way that i know of that you can use an ide cable as apposed to a usb cable for a laptop. As far as I know the usb port WILL power the hard drive.
Edit : If you have a usb 2.0 port it will transfer just as fast as an ide would, the external hard drives generally only run at 5400 rpms so you don't lose and read/write speeds when you use the usb port.
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