[ubuntu] external hard drive mess

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http://ubuntuforums.org – My media folder looks like this: I have 2 external hard drives in use, HD1 and USB-HDD-2, the WD was connected once for backup purposes but is still listed here. And why is the cdrom listed twice ? How can I 1. rename the hard drives 2. fix this list so it only shows the actual devices available 3. avoid this in future Thanks in advance for any help :-) (Hardware)