Cannot unmount USB device

I have an Archos AV5100 connected to my Mac via USB, however whenever I try and "eject" it, after a few seconds, it comes back. If I disconnect it, I get a warning telling me I may have corrupted files on my USB device.
The only workaround I have at the moment is to shut down my Mac when I want to disconnect my Archos, but this is not satisfactory.
Is the problem with the Mac or the Archos? If it's the Archos, I'm probably screwed, as (like many companies) they won't support Macs.

After you disconnect it and get the warning, are
there, in fact, any further problems with it? The
warning is dire, but if the data on the Archos
remains stable, this may be something you will just
have to live with.
Well, there aren't any problems that I know of so far. Archos have been no help whatsoever, simply telling me in their first response to disconnect the Archos as per the instructions (which I already told them I was doing) and their second response was barely understandable,
"This problem comes from the USB controller on Mac OS X. What you need to do is to terminate the USB connexion son the Terminal, or via the "Suspend Application" application.[sic]". Very helpful.
The reason I am concerned is that as soon as I click on the eject icon for the AV500 or drag it to the Trash, the red light on the AV500 (that indicates disk read/write activity) starts flickering away and before it has stopped, the AV500 icon has reappeared on the desktop.

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Cannot unmount USB device

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