In Windows 7, I changed the permissions to access a ntfs partition for all four user groups (Autenticated Users, SYSTEM, Administrators (ADMIN\Administrators), and Users (ADMIN\Users)) to allow only three options "Read & execute", "List folder contents", and "Read".
This is done by right clicking on the partition and select
Properties, and in the security tab click
Edit to change the permissions. I learned it from Dave Rook's reply to my earlier question. (Thanks, Dave!)
Now I want to change back to be able to write into that partition, but I find I am not allowed to edit the permissions including the
Add being grayed out, probably because my account is allowed for the three options only. So I guess I have been locked out by previously changing the permission. What shall I do now?