I have two Samsung 840 EVO SSD's in RAID 1 (Asus P87-Pro and Intel Controller) with Windows 8.1 Pro on it. After a BIOS update, apparently all BIOS settings was reset, which apparently changed the SATA mode from RAID to AHCI (default). Although my Windows should have theoretically booted (from one of the disks), it failed to boot and went to automatic repair. After multiple repairs, etc. I realized that SATA config might be the issue and set it back correctly but again, Windows does not boot with a different error, this time it does not even get to the repair options, etc. screen.


  1. The BIOS does not show the RAIR volume or the the disks (if switched to AHCI mode) UEFI capable and I am wondering what is wrong and if this is the issue.

  2. I have backed up my UEFI keys but it seems I do not have much of a way to recover them, any thoughts on this is highly appreciated.


This may have a good chance to work: Use the second drive to boot in correct mode. The one you 'recovered' let it unplugged and after everything starts, reconnect it and re-mirror the second drive onto the first (the altered one).


After you updated BIOS or cleared CMOS, You have to change the SATA mode to RAID manually before the OS boots. However, If you forgot to change that, you should boot your system with Windows Boot DVD and click the Repair... then you should use the command prompt and run the below command in Windows Drive (for example if your Windows Drive is C: you first run C:):
BootRec /rebuildbcd

I had this problem and used the above command. So, my problem has been resolved. I hope that your problem resolved by that command.

  • Thanks! When I run BootRec /RebuildBcd, it finds my windows installation but when I confirm, it says it cannot find "the device". Running it with other options does not help either. Still, when it boots, it says File:\Boot\BCD is missing. – Mahdi Feb 23 '15 at 14:18
  • You're welcome Mahdi. I think that you didn't install the Mainboard Raid Driver. Please load your Mainboard driver first, then try again. – Tom Feb 24 '15 at 7:46
  • It is an Intel driver, which I have checked and according to MS, comes with Win 8. Also, I can dead and write files to the volume, so I do not think there is a driver issue. – Mahdi Feb 24 '15 at 7:53
  • Please check this eightforums.com/tutorials/… for driver loading during windows 8 setup. – Tom Feb 24 '15 at 10:12
  • Like I said, I do not think this is a driver issue. This drive was used with Windows 8.1 setup before and even the recovery console detects it and can access its contents. – Mahdi Feb 24 '15 at 12:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.