Guest post by Aaron Heidlebaugh.
I just had this happen to me and was able to fix the problem, so I thought I would share.
This was on a Windows 10 Anniversary Edition machine.
After running Snappy Driver Installer Origin (SDIO) and allowing it to upgrade the Intel 8 Series/C220 SATA controller drivers, the computer would no longer boot. An INACCESSIBLE_BOOT_DEVICE message appears after restarting. Startup repair and Automatic Repair fail. In my case, System Restore was not available – every restore point would fail within 30 seconds.
To fix this issue:
1. Go to Intel and get the latest RST drivers – make sure it’s not the installer(setuprst.exe), rather, we want the files in a zip (f6flpy-x64.zip). Version 126.96.36.1990 is what I used and can be found here, Intel® Rapid Storage Technology (Intel® RST) RAID Driver.
2. Boot into the Recovery Environment and open up a Command Prompt.
3. Navigate to C:\Windows\System32\drivers and rename/backup iaStorA.sys and any other iaStor* files (iaStorAV.sys, iaStorF.sys).
4. Copy the .SYS files from the RST zip file you downloaded to the C:\Windows\System32\drivers folder and Reboot. Windows will hopefully boot again and you can get on with life!
It’s a simple fix for a seemingly devastating problem that can’t be fixed any other way (that I have found) – so, I hope this helps a few of you! Good luck!