Not sure, I tried to install Windows Vista, best OS IMO.

Upon making a NTFS Partition, Vista came back and said the Hard drive is partitioned as GPT, a new format to me. Maybe has to do with the Hard Drive being 1.5TiB. Still... it will not let me install windows Vista regardless of what I do. I made the partition 60GB of NTFS and still won't let me install Vista. So I give up. This GPT format is obviously far superior to NTFS when it comes to OS.