This rings a bell. The same thing happened to me when I upgraded from an existing 30 Mb to a new 40 Mb. on an older mobo The problem lies in the fact that your bios cannot cope. You should obtain a disk utility, which you should be able to download from the Western Digital web site click here. Alternatively, you might get away with connecting your new drive as a slve to your existing drive, and then using either FDISk or something like Partition Magic, to format the new disk into manageable sized partitions. However, you msay well find htat your mobo won't even allow you to do this.