I had your P4DL6 motherboard with 200gig IDE hard drive, but the BIOS see as 127gig. Does your current BIOS version on P4DL6 motherboard support 48bit LBA?
The current BIOS 1.1B version does not support 48bit LBA, the new BIOS version will release on our web site soon. If you current need to update the BIOS version then contact with our technical support for new beta BIOS version.