On some systems, GRML hangs for minutes on "Searching for GRML file". When 
watching GRML booting a virtual machine, this shows that GRML tries to access a 
non-existing floppy.

In some systems, it is not possible to disable the floppy controller in the 
BIOS.

Since GRML is way too large for a floppy anyway, I guess that it is safe to 
exclude /sys/blog/fd0 from the list that is obtained in find_livefs in 
scripts/live by echo /sys/block/*.

There should probably be a boot parameter to re-enable the scan of the floppy 
drive for the rare case that this is actually needed.

Greetings
Marc