sparky4601, Your hard drive is a Western Digital. Be sure you register your hard drive here for the full benefits of your purchase. You will have to create an account. If you look on the back of the hard drive you will see a serial number and model number to register in the link above. If you hard drive didn't come with a CD with Data Lifeguard Tools you can go here and select the kind of hard drive you have and download the Data Lifeguard Tools that will do everything for you. Install the program first, then run it after installing. It will then recognize your hard drive and also prompt you to format. It will also ask you if you want to format the drive over 137gb. You will choose yes on that option. Post back if you still need help. BYW, nice purchase on WD. I have 2 of them.