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My PC does not support UEFI BIOS, but it has Legacy BIOS. The motherboard is "P5LD2-X1333".

I need to install Windows 8 on the 3TB hard drive with GPT scheme, since as we know, the MBR scheme does not support more than 2TB space. Also, you can not boot OS from a GPT hard drive without UEFI BIOS.

So how can I use the hard drive with 3TB space with OS and without UEFI BIOS?

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It's a desktop. Why not add a second HDD to use as boot? I'd recommend keeping a data drive separate from the OS drive if you can afford to (makes OS reinstalls much easier). You could put GRUB on a USB thumbdrive if you had to and chainboot to the Windows bootloader on the 3TB drive (not 100% sure the legacy BIOS would allow that) –  justbrowsing Aug 12 '13 at 7:24
    
No I dont have another HDD. instead I have CD\DVD reader and floppy drive. –  IremadzeArchil19910311 Aug 12 '13 at 10:58
    
It is possible on some computers, but the process is awkward. See superuser.com/questions/348146/bios-windows-7-8-and-gpt or superuser.com/questions/494303/…. –  Rod Smith Aug 12 '13 at 17:12
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marked as duplicate by slhck Feb 11 at 7:28

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If another HDD (or at least a USB thumbdrive) isn't an option you are basically SOL.

But since you mentioned a floppy drive... It's a bit crazy but create a Plop bootable floppy. That might work, though seems like a bad idea in the long run.

Of course, Win8 will refuse to install to a GPT disk on a non-UEFI system.

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Windows 7 will also refuse to install. GPT is not supported under BIOS its only supported by UEFI systems. –  Ramhound Aug 12 '13 at 15:23
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BIOS doesn't "support" either MBR or GPT; it's the boot loader that's important. The Windows boot loader is limiting in this respect, but other OSes have no problems booting from GPT on BIOS-based computers. –  Rod Smith Aug 12 '13 at 17:14
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A floppy drive is excellent.

Boot into the Windows install/repair disc.

Just create the system drive on the floppy, and use bcdboot to put your boot files on the floppy. Add a bootsector with bootsect. Change the {bootmgr} device to boot. Boot from floppy.

Steps are detailed here.

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