My external hard drive has disappeared from the 'open file' window in photoshop CS6. It's working fine and appears in other applications such as bridge and lightroom. How do I get it back? I'm running a Mac on OS X.
The "open" and "save" dialogs are OS dialogs. Photoshop doesn't really control the dialog.
Did you hide the devices section in the left-hand panel of the open dialog? (there's a rollover button that says "show" or "hide")
You may have accidentally dragged the drive out of the Devices list in the sidebar.
In a Finder window with visible sidebar, do Shift+Cmd+G to get the Go To Folder dialog. Enter
then click OK.
You'll see all your mounted volumes in the Finder window. Drag the required one to the Devices list in the sidebar.