I was going to tell you about the screw but it seems I am a bit late. I had the same problem though and since I don't have a magnetized screwdriver here at school I never put the screw back in. Also, if you added a second drive you may want to consider moving one drive the other ATA channel. This will allow better airflow, but will more importantly allow you to read/write to both drives at the same time giving you a nice speed improvement if you copy between drives.