We seem to have had a similar problem. I run vista 64 business.
Without any known faulty action on my part, today I found my external
2TB, raid0 (two physical drives) to be read only. Error message told me
approximately that disk was write protected and pointed to file
"msdia80.dll as the problem child. Permissions could not be changed to
remedy read only status (error pops up, again naming msdia80.dll). I
copyed the disk's contents elsewhere in preparation to delete the volume
and start over but disk manager wouldn't let me - all options to make
changes, include delete vol, were not available. The fix that finally
worked for me was simple - ran a check disk - scheduled it for next
reboot. After this was done, when I opened up the disk properties, I
WAS then able to add the extra permissions. Hope this helps.
--
larry
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