Do you use SquashFS on your LiveCD ?
It's  usually the case  on LiveCDs  ... but  squashfs is  a compressed
read-only filesystem  and I think we don't  want to have such  a fs on
our usb key.

> 
> 2008/1/8, Mehdi Dogguy <Mehdi.Dogguy@pps.jussieu.fr>:
> > You can try to make it work  using an usb key. And could possibly then
> > add/remove any package. If you are a Debian lover, you can test it with :
> > http://live.debian.net/debian-cd/4.0_r0-rc1/i386/usb-hdd/
> > or even
> > http://live.debian.net/debian-cd/4.0_r0-rc1/i386/iso-cd/ by editing ISOs
> 
> You can make more than trying : you can make it. ;)
> I know many people who are using usb keys instead of CD/DVDs : they
> have a better throughput, are tinier and survive longer.
> Usb keys are nice when it comes to saving work you've done but, at
> least in its current implementation, this can also lead to problems
> when you try to have your changes automatically recorded (this is not
> available in this livecd atm). Hopefully this only happens after
> several times and hand-copying a package/module or saving a file won't
> do any damage.
> 
> As for this cd, this is an excerpt of the build script:
> > echo "* run $CDDATA/$LIVECDNAME/make_iso.bat to create ISO image"
> > echo "* or copy content of $CDDATA to your USB device"
> > echo "and run ./boot/bootinst.sh (from the device!) to setup boot sector"
> If you try, please, don't forget the "from the device!" part. ;)
> 

-- 
Mehdi Dogguy
http://www.pps.jussieu.fr/~dogguy/