Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

This question already has an answer here:

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?

share|improve this question

marked as duplicate by slhck Feb 11 '14 at 7:28

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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. –  user169106 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

2 Answers 2

up vote 1 down vote accepted

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.

share|improve this answer
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
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

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.

share|improve this answer
The comment below is by Michael P. Warnock but was wrongly entered as an edit to the reply. –  pabouk Aug 27 '14 at 9:57
Not exactly. Once in repair mode it won't recognize the GPT partition where the Windows installation is so you are still screwed because you won't be able to do much if anything without hybrid or other hacks. Just install it with legacy mode enabled instead of UEFI. Who needs all that extra secure crap anyways..and have multiple drives of 2 TB or less if needed. Just a thought. I'm still learning about it all. Takin' it in stride before the next so called great technology appears before us. :) msdn.microsoft.com/en-us/library/windows/hardware/… –  pabouk Aug 27 '14 at 9:59
GPT is a lot more robust, maybe he'll believe me if he sees how fragile MBR disks are. Also he's confused UEFI firmware and GPT partitioning. This is about legacy firmware + GPT. UEFI is not relevant to this method. And it's true automatic repair won't work for this purpose, but the command prompt at that point can fix whatever you need to. This comment is typical anti-MS prejudice. @MichaelPWarnock –  Milind R Aug 27 '14 at 12:57