Hi Rob,
I'm not sure if your unit would run long enough without failing or going unstable, but you can use jEmplode to download the music from the Central to your PC. It does take a while (when my 100GB transfer finishes, it'll be almost one week.

Any chance you have a 120GB drive with lots of music (almost full)? I've noticed some stability issues on my unit with that much music...

Thanks, Randy