The iPod software is not designed to enable the device to act as primary storage for your music. It assumes that there is a 'mothership' to sync with to keep it up to date.
That said, I'm sure some other tech savvy FT person can clue you in to how to do this without losing the original files.
There are ways...
Edited to add: In my view, an iPod and a set of NC headphones are essential for frequent longhaul travellers. What else are you going to do? Read the in flight magazine!
[This message has been edited by michswiss (edited 08-26-2003).]