Are you using a separate PCI card for the SAS connection to the SAS hard drive?
IF so, wouldn't you need the SAS driver for that card? Sometimes they're called SAS RAID controller.
From what I read about the ASUS P6T Deluxe motherboard, it does NOT support an SAS HDD, a controller card is installed instead in a PCI-E slot. (I may be mistaken here but I believe that's your issue.)
EDIT:
This is from Bjorn3D.com:
the Seagate Cheetah NS.2 hard drives are SAS drives, so in order to get these bad boys running, we need a special RAID controller card, that is capable of Serial attached SCSI's and the new 6.0Gb/s interface.
This is from tweaktown.com article on testing the Cheetah 15K.7 SAS drive
Motherboard: ASUS P6T7 WS SuperCoputer (Supplied by
ASUS)
Processors: Intel 975 EE (Supplied by
AVADirect)
Memory: Corsair Dominator 1600 MHz Triple Channel Kit
Graphics Card: Leadtek Quadro FX1700 (Supplied by
Leadtek)
Enclosure: Lian Li V2000
Cooling: Noctua NH-U12P SE2 (Supplied by
Noctua)
SAS Controller: LSI MegaRAID SAS 9260-8i (Supplied by LSI)
Operating System: Microsoft Windows 7 Ultimate X64
So this verifies what I was mentioning before about the separate controller. PLUS it HAS to be plugged into a PCI-E 8X port! The long ones similar to the PCI-E video card slot.
Your motherboard has three of those long slots.
Which version of the motherboard do you have? I found this comment at Tom's Hardware:
The P6T deluxe V1 had a 2 drive SAS controller on board, so it could take these drives. The newer one though does not have this anymore, so you would need an add in card to be compatible with these drives.
Also check out this forum page from the Asus forums website:
http://vip.asus.com/forum/view.aspx..._id=1&model=P6T+Deluxe&SLanguage=en-us&page=1