Need to watch compatibility with flash as well, USB is not so universal. Some machines will lock up tight if you put a flash drive in a USB port. Then there's USB1,USB1.1,USB2... etc, etc. almost as much hassle as DVD compatibilityand also trial and error.
I don't know the details of what he is doing but from what he wrote it looks like he is setting up a new machine with Linux (first time for him) and wants to take data from a Vista machine, so I would
assume both machines to be new enough to be USB 2. I know that when I last saw him he was considering buying a new machine and was disturbed by the directions Microsoft had chosen for Vista (DRM heavy) and was considering Linux then.
I hadn't heard about flash drives being a problem that way, the limited number of machines I have tried them on have (with the exception of a Win98SE machine) all just worked. I haven't tried them on any Vista machines though.
The only issue with DVD I had seen is with a very old DVD drive that predated recordable DVDs, it couldn't handle them, all those I've used built later had no problems. Again with my assumption of fairly new machines I wouldn't expect that to be a problem.
Chances are the native burning tools in vista (i have not used them) burn multisession disks by default and the target system cannot read them. If you can write single session, single track disks and find a setting to close the disk it might work.
From what was written when Vista first showed up I believe you are right. The problem is explaining how to burn for interchange with other machines via E-Mail when I myself have never used Vista and don't know how Microsoft wrote the options. I'm pretty sure if I was able to sit down with him I could figure it out myself even though I haven't used Vista. He is competent with computers but not an advanced user. He is an Engineer who uses computers but is not specifically interested in them and has always used Windows (he might have used DOS a little).
Thanks Bonk.