Windows 8.1Software RAID

I have a client who is using Windows 8.1 and setup a software RAID mirror. The primary hard drive on his workstation crashed, but he was able to successfully boot from the secondary plex hard drive (mirrored drive). He removed the failed drive and attempted to boot from the secondary plex because he wants to added another hard drive to mirror it again, but he receives an error saying there is missing hardware. I thought the purpose of the software mirror was to allow for this sort of thing. I have successfully achieved the above in Windows 7, but not Windows 8/8.1. Any ideas or thoughts?
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noxchoGlobal Support CoordinatorCommented:
If you connect that drive back will it boot? Check the boot order in BIOS. The healthy drive must be set as first boot device.
YortAuthor Commented:
@noxcho - I will give it try.
John TsioumprisSoftware & Systems EngineerCommented:
Before you try anything take a full image of the healthy drive...better safe than sorry.
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YortAuthor Commented:
@tsgiannis - Agreed. We have taken a full backup of the drive. Now, we are proceeding more out of curiosity. We are going to try to the BIOS setting as previously suggested. I will post back after we get back onsite and can try it.
No bios changes needed, the state is: System still booting, mirror rebuild failing. Just remove the missing disk not only physically but also in disk management, then create mirror with the new drive - done. Normal behavior.

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noxchoGlobal Support CoordinatorCommented:
Well, without connecting the bad disk back he has noc chance to boot it :) thats why I am asking as first the question - will it boot when drive connected?
Still, trying the boot order is worth of doing. Mirror supposes that if one drive is dead the second one should work without disk management manipulations.
"Mirror supposes that if one drive is dead the second one should work without disk management manipulations." - sure, and it does, he wrote that it boots. But to rebuild it with a new disk we need disk management, it will not do it automatic - that's what I am saying.
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Windows 8

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