CD/DVD long boot time / unclear log

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

The CD/DVD uses mount_mfs to create a writable directory structure.  Unfortunately mount_mfs copies all overlayed files instantaneously, leading to a very long boot time.

Additionally, the mounts happen after fsck prints some error about /dev/cd0a, so one could get the impression that the system is somehow fsck'ing the CD.