Here is how I was told how to do it - I have personally not tried it.
You can use the iPod Mini to share music between multiple computers, but it's not easy, as the player syncs to only one version of iTunes. But there's an alternative. We were able to copy MP3 files from the Mini to a second computer's hard drive in Windows by turning on "View hidden files and folders" and browsing the Mini's internal directories in My Computer until we found the music. Mac OS X users can do the same thing if they install TinkerTool.
[http://www.bresink.de/osx/TinkerTool.html].
The iPod Mini has no compatibility problems transporting data files between computers (Macs or PCs) when you activate the Enable Disk Use function. In this approach, the Mini mounts as a data drive, but it hides music files unless you use the above-described workaround.