OS boot problem

Question

Windows

There is a computer with raid1 (2 hdd on 1tb, infa) and SSD (system, win7).
Recently, an error appeared in the raid bios near one of the error occured disks, i.e. bad sectors or other problems. As a result, 1 disk remained, the raid degraded, but it works.
The problem is that if you disconnect a working disk from the raid, then the computer refuses to boot from ssd, although in bios the boot priority is from it. Writes no bootable device ...
How to start the system without a disk?
PS As soon as you turn on a working raid1 disk, the system boots fine.

Answer 1

Your MBR is most likely on raid disks. you need to pull out all the raid disks, boot from the installation disk or flash drive and restore the MBR through the console

Answer 2

And if you select the SSD directly through F8?

Answer 3

To be honest, I don’t know what MBR is, I’ll look it up on the Internet, thanks.
And I already chose SSD through F11 (I have it ..), it makes no sense, the same thing.
And how not to repeat the MBR error in the future, install Windows without a raid?