Disk label inconsistencies

[jaymax]

I have a rather bizarre problem. I have been trying to upgrade forever w/
endless problems, but may have found the cause  of some of the problems.
Running O/S 6.0. 

My system disk is displayed in df etc as /dev/ad0 with slice & partitions as
ad0s1a, ad0s1b, ad0s1e, .. , etc. It is similarly displayed under /dev.
However, when I get to the disk label editor it shows up as ad0a, and slice
& partitions as ad0as1a, ad0as1b, ad0as1e, .. , etc. I've tried changing
these, even with the Fdisk editor but they seem to persist, perhaps when I
restore the dump files. 
NOTE: ad0a or add0asx ... etc does not show up under /dev .

Needless to say the following are standard messages from the upgrade
attempts
   Error mounting /mnt/dev/ad0as1e on /mnt/tmp : Input/output error
   Error mounting /mnt/dev/ad0as1f on /mnt/usr : Input/output error


Is there any solution to this short of reformatting the whole disk as new
disk from scratch.

Thanks!

"Disk label inconsistencies"
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