i not sure is a limitation of WIN home ?
in bios you have the correct size ?
It's not a limitation of 64-bit Windows 7 Home Premium. I have a 2 x 1.5TB (3TB logical drive) RAID0 array which works fine. Windows sees it as a 3TB logical drive.
With the Hitachi 3TB drive, the A72 BIOS doesn't see the right size -- only 746GB out of 3TB. It's apparently a problem with BIOS/drive communication, not an OS-layer issue.
My RAID drive forces me to use "Configure SATA as RAID" in BIOS. It is conceivable that using AHCI or some other BIOS settings might allow the P55 FTW motherboard to properly size the 3TB Hitachi drive. Once that's done it would probably work in Win7, if using 64-bit and using GPT partition type.
However changing from RAID to AHCI in "Configure SATA as" would make my machine non-bootable, even though I don't boot from the RAID drive.
So there are two issues here (both involve using 3TB as a data drive, not boot drive):
(1) Whether the new 3TB drives can work with the P55 FTW and A72 BIOS, using any settings whatsoever, even if it requires a total reformat and OS reinstall.
(2) If you're already using "Configure SATA as RAID", or "Configure SATA as IDE", can you add a 3TB drive without re-installing the OS.
I think there are separate disk controllers which could be used, but I was looking for a solution without a controller.
If a controller is required, which one should be used for the Hitachi 3TB drive and P55 FTW mobo?