Lacie External Dvdrw Drive Not Showing On Emac


I bought an eMac last year that turned out to have a non-functioning CDDVD drive. The hard disk is now nearly full so I have borrowed an external drive so that I can back it up and archive some stuff (mainly tunes and photos). However a message is now popping up that says that 'The disc could not be used becuase the disc drive is not supported (Error code Ox80020025).

I used this drive some months ago with no problems.

Can anyone help ?