I apologize if this has been covered, but I have been searching all over the web for an answer. I purchased a used 120 GB HDD for my 360 to replace my 60 GB one. I also purchased a data transfer cable, which sadly, i realized too late that is not official Microsoft, which I've read is the way to have it work. So when I plugged the new drive into the front of my 360, I did not get the automatic "transfer cable detected" message. But I went ahead and formatted it as the previous owner had left all of their stuff on it. After formatting was complete, i could only use it as a 16 GB flash drive and the 360 would not detect it when i connect it on top. I can plug it into my PC which recognizes it just fine and shows that it is now simply an extenal HDD for my PC minus the 16GB xbox allocation. All I need to do is get my Xbox to recognize it so I can format it. I don't care about data transfer at this point. I will re-download everything if I have to. I am currently formatting it to FAT32 via my command prompt, but it is taking so long, I am still exploring any possibility. thanks for any input.