> Wow, that's a good idea.
> 
> The only thing I need, is a low level SCSI-Editor (like SEDIT for MacOS,
> which I have) and the correct input for the MBR and the PM entries.
> 
> If you could give me the structure of these tables, I'd like to try it.
> 
> BTW my first try without knowing the exact structure was: 
> 
>  Get 2 PM entries of a NetBSD formatted disk

If the disk only had one partition on it, that should work.

>  Copy them to sector #1 and #2 of the MSDOS disk

You need to keep the upper few bytes of sector #1 of the MS DOS disk
as that's where the MBR partitions live...

>  Modify the block numbers of the PM
>  Copy the beginning of sector #0 of the NetBSD disk ("ER" 0x02000003 )
>  to sector #0 of the DOS disk.
> 
> Result: disklabel and mount_msdos did no longer complain about "missing
> disklabel", but the mount told me, "wrong parameter".

What did disklabel say about the drive?

Take care,

Bill