Can't access my external hard drive

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http://crunchbanglinux.org – Hi, I recently started using #! after I bought an old Dell Inspiron with a 40g hard drive. I've been loving it (the OS) except for the fact that I can't access my external hard drive. I really have no idea what's going on, so there isn't much information I know to give. The external was formated to ext3 or ext4. I don't actually remember which, but I had to do it when I had my last computer on Fedora.Basically, I plug it in and I get a pop-up saying Failed to open directory "av".Permission denied.This has kept me from getting to any of my files, so I'd r (HowTos)