Need Help About New Harddrive

cihank1 · Oct 28, 2015

Hey guys, I have a problem. I just bought a 3 TB harddrive. When I try to install Windows 10 on it, I can only allocate 2.2 TBs. The remaning 765 GB can't be used. When I try to allocate space on it, Windows setup says "Error:0x80042468." I looked it up on the web and found some stuff about "motherboard UEFI support," etc. But I couldn't get a clear information. (By the way, my motherboard is Gigabyte 78LMT-S2PT).

Is there a problem with my motherboard? Can I somehow use the entirety of my new harddrive and not just 2.2 TB? Please help! (English in not my native language, sorry for any mistakes.)

jsmithepa · Oct 28, 2015

cihank1 :

That is PRECISELY CORRECT. Your motherboard MUST have UEFI support. I briefly scanned your motherboard manual and could not find mention of UEFI. So unless Gigabyte has a new firmware update to provide you the UEFI feature...

Two other options:

1. Run a PCIe Sata controller with UEFI.
2. Partition HD as 2+1 terabytes, so you end up with C: (2T), D: (1T)

SuperSoph_WD · Oct 29, 2015

Welcome to the community, cihank1!

The problem you are encountering is that the HDD must have been initialized with MBR partition table or you've been booting into Legacy BIOS, instead of UEFI. According to the specs to your motherboard, it should be able to support DualBIOS (including UEFI). What you need to do is to boot into UEFI and install Windows 10 onto the 3 TB. This way the drive will be successfully initialized in GPT (GUID partition table), which will make the whole 3 TB capacity available to you. Here's a tutorial from Tom's Hardware, that you might find useful: http://www.tomshardware.co.uk/faq/id-1923415/install-windows-3tb-4tb-larger-hdd.html

Good luck! Hope it helps!

SuperSoph_WD

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