I might have fixed:

Try new DVD+RW  -- mount , and cannot do anything

THEN I did:

newfs_udf /dev/rcd0d

mount -t udf /dev/cd0a /cdrom

to test copy large file to DVD+RW, and delete it. That worked.

I will reformat tho old DVD+RW disks.

On Mon, Jul 29, 2024 at 3:43 PM Robert Nestor <rnes...@mac.com> wrote:
>
> It’s been a few years since I played with RW DVD so this may not be correct, 
> but as I recall they’re basically like flash.  New write/deletes basically 
> revector previously written blocks to new blocks called “sessions” until 
> there are no more unused blocks on the device OR the last write closes the 
> session.  At this point the DVD becomes RO and can only be restored to be RW 
> by totally erasing the DVD.

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