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#11
I assume the drive is set asside for Data and is formatted NTFS?
With these assumptions I would appear that you have an NTFS Permissions issue.
NTFS permissions are written to the actual drive and are persistent over an Operating system Change.
Although we allocate permissions to Names users the system sees these as an ID. Although we may create the same user name on a new install it is almost certain that the system will allocate a different code.
as you cannot see the drive contents at all you may have to enable the hidden administrator to "see" the drive, and to give control of the drive to either the Administrators group, or your actual user - once you have access you can allocate the rights to the drive for users as you deem fit