Jeff <jcoppock1@attbi.com> wrote: ] I'm not familiar with the 12.5mm vs. 9.5mm HDD. What does this ] describe? It's the physical dimension of height of the device. In the new high-capacity laptop hard drives they use more platters in a taller stack. I think the highest capacity 9.5mm hard disk is 40 GB, and the 12.5mm disks go up to 60 GB. Sebastian