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Posted

I'm having trouble with one of my Windows 8.1 PCs. It has 4 internal hard drives and only two of them are showing up in Windows Explorer. I see all of them in Disk Management but it gives me an error if I try to give them a drive letter:

 

diskserror.png

 

It also doesn't mount external drives when I plug them in. They were all working before the upgrade in Windows 7. This PC has an Asus P8Z77-V DELUXE motherboard if that helps any. I can confirm all the drives themselves are good.

 

disks.png

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Posted

Is that system in UEFI mode? I'm guessing they are from a UEFI system with secure boot and now you aren't on that system anymore?

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Posted

Can't you disconnect all drives, except C, then add them back one by one, in the order you want them in ?

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Posted

Is that system in UEFI mode? I'm guessing they are from a UEFI system with secure boot and now you aren't on that system anymore?

 

I'm not sure. I don't remember seeing any UEFI or secure boot stuff in my BIOS settings.

 

 

Also I don't want to format the disks. They have stuff on them.

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Posted

I'm not sure. I don't remember seeing any UEFI or secure boot stuff in my BIOS settings.

 

 

Also I don't want to format the disks. They have stuff on them.

Your PC is UEFI. Try enabling the CSM option under Boot

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Posted

Your PC is UEFI. Try enabling the CSM option under Boot

 

Ok, I checked and all the Secure Boot stuff is on.

 

I also am able to access the drives if I use a partition tool to give them a drive letter, but I have to do it every time I restart Windows.

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Posted

Ok, I checked and all the Secure Boot stuff is on.

 

I also am able to access the drives if I use a partition tool to give them a drive letter, but I have to do it every time I restart Windows.

 

I am guessing your boot sector is on another disk than the one where windows is installed. I would leave secureboot on and CSM off. Unplug all disks, clean install windows, then plug the other discs in. When booting from the windows install disc, ensure it is the UEFI mode version of it. If you press F8 during boot you will get a dialog showing you available disks, you will see your optical appearing twice; normal mode and UEFI mode.

I have a similar config as yours but I run the P9X79 Deluxe motherboard.

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