I had previously partitioned my Imac with 25 gb so I could play my games in Windows. Today I was trying to run Time-Machine to backup my files. There was a problem with the new Mybook external drive I had and it said that I was unable to save and it needed to be reformatted. Stupid me didnt fully read (i know how dumb it sounds) and I hit erase the everything on the drive. Little did I know, but it was actually the partition for windows that I erased. My external drive had come lose when I turned the machine and wasn't connected to the computer. I had assumed that I was reformatting the new drive; however I was actually destroying my partition. I really need some help here. I attempted to partition the drive again; however I am being told that the drive needs to be a single drive. I totally understand what needs to be done but I dont know where to find the drive. Here is exactly what happens when I enter the Bootcamp utility: "The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows." Please tell me what needs to be done. I didnt have anything other than games on windows, which isnt the end of the world, but I would like to have Widnows on here again. Sorry for being an idiot. I hope you all have a good laugh at my mistake. Thank you for your help in advance. I hope there is something that can be done.