This one is somewhat different for readonly optical media
(where [auto]mounted disk is a nuisanse) and writable USB
Flash or even fixed disk (where it's too easy to destroy
data by missing the right letter).

...so that it's more applicable to a wider set of images
(those lacking e2k-alt-linux' specific labels just won't
get broken default boot target label name for no reason).

...otherwise a whole-disk block device would be accepted
by the script but not by the firmware's bootloader.

Optical media isn't to be checked for those of course.

...so that further reading is at least referred to
(the script gets into current ISO images).

Yet another silly distraction...

There's some peculiarity in writing ISO images for e2k
onto USB Flash media: we need to arrange a partition
and ext2 filesystem with its label passed to propagator;
the former part is what's expected, and the latter one
is what this script does.

Thanks to aerodisk.ru guys for catching a brown paper bag
class typo making format() try to affect the image and not
the drive, by the way.