I have a curious issue. I have done a fresh install of Windows 7 with a new motherboard and I have connected my two seconday drives. One function fine, but the Samsung Spinpoint shows "Access Denied" whenever I try to access it. I have gone through and changed permission. I have also attempted to change ownership, however after it all goes through it's run of changing ownership and it says "If you have just taken ownership of this object, you will need..." it is still denying me access. I go back into the ownership window and it still reads "Unable to show owner" when I change it to Admins, if I change it to my account name it shows my account name but still doesn't allow access. I have tried this is normal and safe mode, with restarts after each. I am running x64 Windows 7 Ultimate.
Edit:I had forgotten to mention, I can access the files using a program that bypasses permissions so I know it's fully functional.
There is a bug in Windows 7 that prevents you from taking ownership of folders that you have created. Installing the updates corrects this problem. Maybe your problem is related, have you installed the updates?