Have you considered it could be a resent hard drive layout modification. I haven't had time to investigate.
http://en.wikipedia.org/wiki/Advanced_Format http://www.bit-tech.net/hardware/storage/2010/04/01/the-facts-4k-advanced-fo rmat-hard-disks/1 http://support.dell.com/support/topics/topic.aspx/global/shared/support/hard _drive_support/hard-drive?DoNotRedirect=y Nolan
