Cannot open files in portable hard disk using USB 2.0

My friend using a 20G Portable Hard disk and told me that he could not open files on it when he connected it to his iMac G5 with the USB 2.0 cable. He gave it to me and I found the same result with my iMac G5 2.0. I have tried using Disk Utility's repair but found the rainbow ball rolls on and on. Whenever I tried to open any files with Finder, the rainbow ball appears again.
The portable hard disk is fine with PC and my friend said his G4 is alright with it too.
Is the problem due to iMac?

Also, try connecting the drive directly to a USB port on the iMac. The USB ports at the back of the keyboard are convenient but slow, since its built-in hub is USB 1.1. It supplies a total of 500 ma, the same "juice" as other hubs, but the Apple Pro Keyboard uses half of that.
The ports on the iMac itself each supply the standard 500 ma, and are high speed USB 2 ports, so they are the preferred choice.

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