Is there a reason for the d_typename[16] member of the disklabel
to be '\0'-terminated?
/sbin/disklabel doesn't seem to need it, from a first glance.

What bothers me is that device type names of SCSI disks get
crippled if the name uses all the 16 product name bytes in
the inquiry reply, ie
$ /sbin/disklabel sd0
type: SCSI
disk: RZ57     (C) DE
label: ULTRIX compat
[...]

Not too serious, though...

best regards
Matthias