I use NTFS-3G in order to let myself read and write to my external hard drive in the correct format. My Mac is also bootcamped with Windows 7 on the other side.
Every time I startup my Mac I get an error saying that /dev/disk04 could not be mounted, and it asks me to force or abort it.
Any ideas as to where the root of that problem might be? I think it may be related to Boot Camp.
Screenshot of when harddrive is plugged in:

Disk Util Output:

diskutil list. Can you add that to your question? – slhck Jan 4 at 9:42diskutil list. Paste the output here in the editor, and don't forget to select the text and pressCtrl-Kso the code is indented properly. Also, where and when exactly is the output shown? In a window in Finder? – slhck Jan 4 at 9:47