Hm, not easy to reproduce, though:
$ mkdir /tmp/x; cd /tmp/x $ touch foo bar $ mkisofs -o /tmp/test.iso -v -V "Name " * $ blkid -p ../test.iso ../test.iso: LABEL="Name" TYPE="iso9660" USAGE="filesystem"
So this basic case seems to work.
Hm, not easy to reproduce, though:
$ mkdir /tmp/x; cd /tmp/x
$ touch foo bar
$ mkisofs -o /tmp/test.iso -v -V "Name " *
$ blkid -p ../test.iso
../test.iso: LABEL="Name" TYPE="iso9660" USAGE="filesystem"
So this basic case seems to work.