[Caprice]

I have a Mac Pro with my OS and apps on a SSD while I store my data on a HDD in another bay in the Mac Pro. I am running Lion, and I recently (a couple months ago) turned on FileVault. I believe by doing that it changed some of the sharing & permission settings in my data HDD because now my other user accounts which are admins can't access some of the folders in the HDD. Am I correct, turning on FileVault changed Sharing & Permissions on the data HDD? For example, I have my user account set to download files from Safari to a folder in the data HDD, but my other user accounts with admin privileges can't access this download folder. I am pretty sure they could before.

Looking at the folders on the data HDD via Get Info my user name is on the top of the list, so I assume I "own" it. What's the best way to set Sharing & Permissions, so that my other user accounts can access the data HDD? There's a "staff" icon, or I can individually select users, or I can use the "admin" selection, and finally there's "everyone" selection.