UEFI or Legacy RAID configuration

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bandit385

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Jul 11, 2008
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I'm looking to add a RAID drive to my system for data storage. (Two 2 GB SATA drives in RAID 1 configuration)

I have a Gigabyte Z170X motherboard. Boot drive is a M.2 PCIe SSD set to UEFI mode and GPT partition. Do I setup the RAID drives as a UEFI RAID configuration or Legacy RAID ROM? Or is there a choice? Also, will I need to setup the RAID drive partition within WIndows as GPT as well?
 
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photonboy

photonboy

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Jun 20, 2006
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If you've installed Windows as UEFI then probably Legacy mode for other drives won't work.

It's a bit confusing though, but if you changed CSM (Compatibility Support Module) to Legacy for drives it might prevent Windows from booting up.

Read your MANUAL as well, but I'd choose the UEFI option.
 
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photonboy

photonboy

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Update:
I don't know if you can add another drive through the BIOS without losing the data on the first drive. You better be sure of that. I know you can add another one via Intel RST (is that right?) in Windows though RAID1 performance via software RAID would be slower likely.

 
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bandit385

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Additional info. I'm keeping my C drive as is (PCIe SSD with Windows as UEFI) and adding 2 new drives (to 2 SATA ports) in a RAID 1 configuration that will be used for data storage. The C drive will not be part of the RAID array.
 
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bandit385

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I installed the raid drives in Legacy mode and kept CSM enabled. The drives however only show 1.81 TB free (3.03 GB used) out of 2 TB HD. Is this normal? Would configuring the drives in UEFI RAID make a difference?

(I checked the storage settings within Windows 10 and it indicates the used 3.03 GB are System files to help Windows run properly. Your PC won't work without them)
 
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stefstef

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Apr 17, 2017
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Hey Bandit, I would like to do exactly the same thing than you did (I have the same motherboard). I think 1.81TB free, 3.03GB used is totally normal, when i plugged my disks normally - without raid - I had the same thing, with 2 disks : WD blue 2T0 5400t/min

Can I have more info about your opération? everything happend fine with legacy mode? why did you choose legacy and not UEFI ? did the opération erase your data on the hard drive?


Thanks !

 
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