Cant see SATA III disc

Attach it to an Intel SATA II port -- it will not negatively affect the performance and may solve the issue.

If doesn't fix the issue or if you just want to figure it out (like I would), update the motherboard bios and Marvell driver if there is a newer version for either, and insure after update that the Marvell controller is still enabled in the bios. Also take a look here, as it may be a 3Tb issue in an older bios, especially on the non-Intel controller: http://event.asus.com/mb/2010/disk_unlocker/

HELLO YOU HAVE A BIOS ISSUE. ASUS HAS LEFT YOU WITH AN OLD BIOS.  

Most legacy systems built before 2011 have a traditional PC BIOS. This type of BIOS uses a Master Boot Record (MBR). The MBR Partitions can define a disk drive capacity up to 2.2TB. Windows operating systems that boot from an MBR are therefore limited to 2.2TB per MBR. A 3TB disk drive in a legacy BIOS and Window system will need a DiscWizard device driver to access the full capacity of a 3TB disk drive. Two partitions will be necessary because of the MBR limitation. The device driver mounts the capacity above 2.2TB with another MBR which looks to the system as a second virtual “physical” device.

GUID Partition Tables (GPT) can define drives larger than 2.2TB. You can use GPT today on any Windows 7 and Vista system as a non-booting data drive. Windows can only boot a GPT partition on a new type of BIOS called UEFI.

UEFI BIOS desktop systems are new since 2011. Windows 7 64-bit and Vista 64-bit operating systems support booting from UEFI and GPT without the need of a non-Microsoft device driver. This is the Windows native solution for booting a 3TB drive to a single partition.  

ASUS Disk Unlocker supports H57 chipsets, so he should be able to use the 3Tb disk on that board, even if they never released a bios that supported it. Probably can't boot from it, but who uses a 3Tb drive as a boot drive?

That solution was release almost 2 years ago for many ancient chipsets: http://www.tomshardware.com/news/Disk-Unlocker-GUID-Par...

Thanks for the info.
Unfortunatley its really gone pear shaped now.
I updated the BIOS to ver 1606 and now I get the blue screen of death.
Have tried to revert to BIOS ver 1304 but it wont allow me - I get a message saying the BIOS is older than the board.
Arrrrrgggghhhhhhhhh!

Try clearing the bios by using the jumper or disconnecting the bios battery and unplugging the machine. Also check all of your bios settings to insure that they are correct, often the new bios reverts to old settings like IDE sata mode that will cause a BSOD.

Hello,

Boot up and report what the BSOD says. It may give you a hint as to the problem. Some are tough to remedy. Others are fairly easy.
Also check in the SATA configuration choice and see if it is set to IDE, AHCI, or RAID.