Converting System to UEFI to support 4TB disk

[windyweather]

Just converted my systems to Windows 10. Working well, so far.
I would like to install 4TB disks on a couple of the systems and understand that I need to use UEFI.
Looks like my ASUS P8Z68-U GEN 3 MB supports UEFI, but I don't understand how to enable it. The other system has ASUS B85M-E mother board.
I've seen some one paragraph descriptions, but they don't really walk me through the process.

1 - Can I upgrade my existing system without a complete Windows 10 reinstall? I have lots of apps installed so I'd like to avoid complete system rebuilds.

2 - Due to legacy use of Mirrored drives, I'm using the Intel RAID stuff, although I no longer need it. Will that be a problem? SSD and other disks are JBOD. I'd like to get rid of that, but I think that does require a complete system reinstall since disabling the RAID wipes the disk.

Can someone point me to video or other step by step process to convert a system to UEFI to support 4TB disks?
Thanks much,
wg

 

[windyweather]

I just discovered that the ASUS B85M-E mother board system is apparently booting Win 10 with UEFI and has RAID disabled. When I put the 4TB drive inside on a SATA bus it came up fine and I can see all 4TB. Guess I'll try the other system. When attaching the 4TB disk to the system with a USB adapter, It only saw 2TB. Maybe the USB adapter is the problem. Guess the next thing to do is try a 4TB disk in the P8Z68 system and see if it just works.

We'll see.
ww

 

[windyweather]

My problem was attaching the 4TB drive with a USB adapter and seeing only 2TB. When I attached it internally on a SATA III port it worked fine. One on each of the two MBs in question. I guess having modern UEFI "capable" bios is enough. Got a 4TB going now on both systems. Of course I used Disk Manager to format the drive with a GPT - the only choice - and NTFS.
Thanks all.
ww