USB card reader problems

I'm using a new MacBook Pro with an old USB 2.0 card reader (21-in-1 TDE) - but it keeps unmounting, just long enough for the file transfer to fail. I get a message saying I've disconnected the storage device.
I've changed the cable, tried the reader on a Mac Pro (which worked fine) and the problem doesn't occur with a FireWire reader. Other USB devices seem to work OK. My system is up to date (10.4.8), has 2GB RAM and occurs regardless of trying to download images via Aperture) or simply copying the files from the card in Finder.
Given the hardware works fine on another machine and Firewire gets around the problem, I reckon it's a USB problem - but hardware or software?

I'll try that when I'm back at work in the New Year (I don't have a powered hub here), but I will be surprised if it fixes the problem - after all, the machine provides enough power through its USB ports to run an iPod (complete with a 60GB hard drive), why not a simple card reader?
It would also mean I wouldn't be able to download images at on-site shoots (no mains power).

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