I have 250 gigs HDD which I have partitioned into 2. One Extended(Journaled) and other as MS-DOS FAT32. My photos library is on FAT32 which I want to make READ-ONLY. This is because I want to manage photos with iPhoto but in no circumstances, let it screw my Library. Problem I am facing is, I am not able to make the permissions "READ-ONLY". I am the administrator and I could change permissions form my Mac partition. Why is that I am not able to change permissions on FAT32? I tried going to System Preferences and Sharing. I have included the mentioned drive in shared folders and users against them are READ-ONLY, only to find them READ-WRITE when I open this window again. What can be the issue.?