I have a MacBookPro with OS 10.6.8 and a Western Digital 500GB hard drive. The issue is anytime the hard drive is plugged in the trash bin has a file in it that does not exist on the drive. As soon as the drive is removed the trash bin is empty, yet I am unable to remove that file from the trash. How do I remove this file so it does not appear in the trash every time the drive is plugged in? Can this be done without removing everything else from the drive? Any help would be appreciated, thank you.