Hi -

  I was pleasantly surprised to find that -current of a couple
of days ago will let me use /dev/rcd?d and /dev/cd?d to do disk-like
things: edit an in-core disklabel, newfs_ffs a partition, dd a partition
made with mkisofs onto the DVD-RAM, and mount it.

  The drive in question configures as 

cd1 at scsibus0 targ 4 lun 0: <MATSHITA, PD-2 LF-D100, A113> SCSI2 5/cdrom removable

  There is a pair of nagging problems:

1/ I cannot write a disklabel to cd1.   It chokes like this
   	sean# disklabel -R -r cd1 /tmp/a
        ioctl DIOCWLABEL: Bad file descriptor
2/ I can newfs an FFS partition, even with -S 2048.  I can run fsck_ffs
   and all is happy, but when I try to mount the partition, things fail
   like this:

sean# newfs -S 2048 -i 8192 /dev/rcd1d
Warning: 38 sector(s) in last cylinder unallocated
/dev/rcd1d:     25562 sectors in 256 cylinders of 1 tracks, 100 sectors
        49.9MB in 16 cyl groups (16 c/g, 3.12MB/g, 448 i/g)
super-block backups (for fsck -b #) at:
     8,  1608,  3208,  4808,  6408,  8008,  9608, 11208, 12808, 14408,
 16008, 17608, 19208, 20808, 22408, 24008,
sean# fsck_ffs -f /dev/rcd1d
** /dev/rcd1d
** File system is already clean
** Last Mounted on 
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
1 files, 1 used, 24976 free (8 frags, 6242 blocks, 0.0% fragmentation)

(incidentally dumpfs at this point says all the right things)

sean# mount -r /dev/cd1d /mnt
mount_ffs: /dev/cd1d on /mnt: incorrect super block

Is this in any way fixable?

	Sean.