Thank-you for your question.
The solution to your problem is to use MediaFour's XPlay program.
This, to the best of my knowledge, is the only software that allows
you to use a Mac-formatted iPod with a PC without losing all the
information on the iPod.
"Want to share your iPod with both a Mac and a PC?
XPlay is the only way to achieve cross-platform harmony. With XPlay
you can use a Mac-formatted iPod to bounce seamlessly between a Mac
computer and PC."
XPlay is a very simple-to-use program that works in an interface like
Windows Explorer and I used to recommend it to everyone when I owned
an iPod. To transfer music to/from your iPod you simply need to
drag-and-drop the music files to/from your hard drive.
"Moving your songs to the iPod is as easy as copy a file to a disk.
[...] With XPlay there is no need to launch an application. Simply
drag-and-drop the music files you want into XPlay music folder. The
music is automatically organized on the iPod. Inside the XPlay music
folder your songs are arranged just as they are on the screen of the
iPod. You can browse your music by Playlist, Albums, Artists, Genres,
Composers and all Songs. Having your music collection with you on your
iPod is great, but it sure feels nice to have a backup of your
collection on your computer. XPlay enables you to copy your music from
your iPod to your PC. No more worries about losing the thousands of
songs you own. Simply save them to your PC hard drive. It's a quick
and easy way to ensure your peace of mind."
The only downside to XPlay is that it is not free but you can download
a free time-limited trial version of the software that you can use
prior to giving the iPod to your friend.
If you require any further assistance on this subject please do not
hesitate to ask for clarification.