I run with 2 external USB disks and have for years. Most of the time my root partition is on an USB disk.
> > D-i is straight forward, just select the USB disk. Instead of grub I prefer > to run with SuperGrubDisk because that allows you to search for the right > partition and fill in what the rootdevice is. Otherwise you are always > messing around with what the disk number is. Because that changes. > > Pro: much easier to change the disk. > Con: slower than an interior disk. Except when you can use the SATA cable > on the exterior disk, but I have trouble with my mobo on that. > > I've successfully installed Debian Squeeze on an external USB disk. At first grub was incorrectly installed on the internal disk, which caused the system unbootalbe. Then I used the install disk as a rescue and fixed the issue. Thank you all! Best regards, Yuwen