On Jun 30, 2009, at 3:25 PM, Rick C. Petty wrote: > > According to wikipedia, the GPT header contains: > - (offset 40) First usable LBA for partitions > - (offset 48) Last usable LBA These do not represent the media size. They relate to the region of the disk that can be assigned to partitions. -- Marcel Moolenaar xcllnt at mac.com