I had Windows XP Pro running fine on this particular drive, but decided to clone over a Win XP Pro x64 installation from a 200GB drive. This entailed moving the 300 from one machine to another (newer) machine where the 200 was in use. Once attached the new machine reported the 300GB drive as only 127GB in size. That's where I stopped; no cloning took place. Since then moving the drive back to the original machine, using partition software to look at the drive, nor anything else has revealed the drive to be anything other than a 127GB drive. What procedure can I use to return functionality? Maxtor's utilities are useless. I can have this drive attached to an ASUS A8N32SLI Deluxe, or GigaByte K8NS Pro MB, so either way the drive will be behind an 'onboard' controller.