Solved Boot problems w/ W8.1 multiple sata disks

Hello everybody,

I 'had' perfectly running system (Asus Z87-A, Samsung SAMSUNG 840 Pro Series *2, Seagate Brracuda 1TB 7200.11 series *2).

I've got perfectlöy running 8.1 x64 homr edition on Samsung SSD disks. I used to have Win7 32b version on HD-Disks, which I later used as storage disks. However I left Windwos7-directory intact in 1st HD-disk.

I experienced slight problems with Barracudas and found out there's a firmware update for my specific model.
When I unplugged SSDs, the old windows 7-installation attempted to repair my system, and since that I cannot use SSD and HD disks same time.

All disks are in ACHI mode.
If just the SSDs are connected everything works, however if I add any of the HDs, system whether fails to start or tries to start old windows 7.

Now in EZ setup SSD are P1-P2 and HDs P3-P4.
For some reason the system always boots the P3 even P1 is 1st in order "Windows boot manager"
I also checked BCD entries and they are correct.

Is is possible that when I disconnected SSDs, windows / wrote the MBR on HD (P3) and now tries somehow to boot there everytime i try?

I've got recovery disk, but automatic startup repair failed. I can access diskpart through cmd prompt.

Help appreciated!

Hello, I managed to solve this by updating the bios. Still, this was really strange case.....

rautasiili said:

Hello, I managed to solve this by updating the bios. Still, this was really strange case.....

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Actually unless you were going to run a Dual Boot you should have disable the old win 7 boot sector. By leaving it as you found windows 7 tried to repair itself. Your win 8.1 should be set up UEFI then it would not recognize the old window 7 MBR boot.