[hb]: CDs are not usable anymore

FreeBSD's disc1 image has surpassed 700MB, which is CD-ROM max size. dvd1 image
is also almost at its limit, which is 4.7GB for single layer DVD (FreeBSD 14
dvd1 is 4541104128 bytes=4.54 GB).

PR: 257347
Approved By: releng (karels)
Differential Revision: https://reviews.freebsd.org/D42773