Hi There,
I have a few Dell Vostro Machines that contain 2 Disks. The primary OS disk being an SSD, and the secondary being a HDD. These are both activated within the bios and are readable/writeable through windows.
I am facing only issues when installing anniversary updates it seems. Once I update the machine with the AU updates and reboot, we get errors such as " operating system not found", "utility partition not found".
Upon inspection using testdisk, the MBR is completely gone. It contains no data, no partition tables exist either. I fix it with the following:
I firstly use testdisk to find all the partitions and write them into the partition table.
Then I boot into a windows ISO and run bootrec.
>_bootrec /fixboot
>_bootrec /fixmbr
>_bootrec /scanos
>_bootrec /rebuildbcd
>_bootsect /nt60 all /force
Now this will temporarily fix the issue, until we reboot again at some point, then I need to go through the whole process again.
One way that I'm fixing this is to disable the Updates completely and removing the AU updates. This works fine, rebooting doesn't cause any more MBR boot failures. Upon allowing the updates to come back through, the MBR will be trashed once more.
It seems to be these 1 or both of these 2 updates that are causing it KB3176936 / KB3189866.
Do you have any suggestions? I'm pulling my hair out. I've tried a clean install, which didn't work, the same issue occurred.