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MSI Z87-G45 UEFI RAID problem

Last response: in Motherboards
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January 15, 2014 8:50:57 PM

Hello I have the following issue:

I want to make RAID0 with 2x 2TB HDD and I have SSD for system volume. As I found out, drive should be connected using UEFI in order to create a partition bigger than 2TB. All my drives are detectible only in legacy mode. There are 2 options in my mobo settings for boot mode: UEFI and Legacy + UEFI. If I chose just UEFI, only USB stick is detected. If I create raid using build in tools it is still undetectable in UEFI mode.

What am I doing wrong?

Thank you
a b V Motherboard
January 15, 2014 9:12:50 PM

I have the same MB and had the same problem with UEFI Mode; The DVD rom drive would not be detected as UEFI, so what I did was I created a USB Windows 8 installation and that allowed me to install via UEFI:Kingston 8gb usb drive or whatever and then Windows 8 (and or 8.1) creates the necessary UEFI partitions to install 8 or 8.1 onto the drives. I did not do RAID, but I think that your main problem is the same as mine was; The bootable device.
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January 15, 2014 9:20:47 PM

It detects USB stick with UEFI mode fine, but not other devices. I need to find a way to make it detect my raid with UEFI, so I can make one 3.6 TB volume, instead of splitting it into 2.0 TB and 1.6 TB volumes.

So it looks like mobo issue? I tried updating BIOS, but it did not help.
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a b V Motherboard
January 15, 2014 9:39:45 PM

Normally, RAID is set up as drives of all the same size. I suspect, that you're using a 240gb (or thereabouts) SSD and it is messing things up.

I am not an expert on RAID of any sort, nor have I have set up any at all. However, I do believe that the SSD in the equation is messing things up. Anyone else have any more educated thoughts on this, than myself?
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Best solution

a c 559 V Motherboard
January 15, 2014 10:04:53 PM

Nikita Tsytsarkin said:
Hello I have the following issue:

I want to make RAID0 with 2x 2TB HDD and I have SSD for system volume. As I found out, drive should be connected using UEFI in order to create a partition bigger than 2TB. All my drives are detectible only in legacy mode. There are 2 options in my mobo settings for boot mode: UEFI and Legacy + UEFI. If I chose just UEFI, only USB stick is detected. If I create raid using build in tools it is still undetectable in UEFI mode.

What am I doing wrong?

Thank you


Set SATA to RAID, configure the RAID array, leave the SSD non member, start installing Windows on the SSD in legacy mode, load the RAID driver during the installation. If successful, open Disk management and convert the RAID volume to GPT and format it.
Try and see if working.
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January 15, 2014 10:23:50 PM

alexoiu said:
Nikita Tsytsarkin said:
Hello I have the following issue:

I want to make RAID0 with 2x 2TB HDD and I have SSD for system volume. As I found out, drive should be connected using UEFI in order to create a partition bigger than 2TB. All my drives are detectible only in legacy mode. There are 2 options in my mobo settings for boot mode: UEFI and Legacy + UEFI. If I chose just UEFI, only USB stick is detected. If I create raid using build in tools it is still undetectable in UEFI mode.

What am I doing wrong?

Thank you


Set SATA to RAID, configure the RAID array, leave the SSD non member, start installing Windows on the SSD in legacy mode, load the RAID driver during the installation. If successful, open Disk management and convert the RAID volume to GPT and format it.
Try and see if working.


That is what I was going to do next. I tried loading drivers during installation and formating that drive, but installer split it into 2 drives again. I tried to recreate raid, but it messed up windows installation. Probably windows saved few files on HDD, even though SSD was selected as a drive to install. Reinstalling windows now to check it.

BTW, is there a way to uncheck best solution? I accidentally clicked a link in an email and it selected post which was not a solution.
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January 15, 2014 10:28:28 PM

UPDATE: Windows splits that raid and creates 100 MB volume during installation without asking, even though I install windows on SSD. I will try to reinstall it again but with disconnected drives
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January 15, 2014 10:50:46 PM

Thank you alexoiu!

Disconnecting RAID drives, installing windows on SSD, reconnecting them back and formatting using diskmgmt.msc solved my problem!
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a c 559 V Motherboard
January 16, 2014 12:03:24 AM

Thank you for the follow-up. Good luck!
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