I tried. :]
0 0
Code:
# cat fstab
/dev/wd0a / ffs ro 0 0
# mount -v
/dev/wd0a on / type ffs (rw, local, ctime=Fri Aug 15 05:30:45 2008)
dmesg:
Automatic boot in progress: starting file system checks.
Note, no file check takes place.
1 1
Code:
# cat fstab
/dev/wd0a / ffs ro 1 1
# mount -v
/dev/wd0a on / type ffs (rw, local, ctime=Fri Aug 15 05:34:20 2008)
dmesg:
Automatic boot in progress: starting file system checks.
/dev/rwd0a: file system is clean; not checking
Both still read write.
Best wishes.