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Windows 7: Disk 2 Does Not Boot OS When Selected as the Boot Device on Startup

09 Oct 2011   #11

Windows 7 Pro SP1 x64

I tried the following but still did not get it to work:

To get a MBR on Disk1 which would provide the ability to boot into it using F12, I tried the following:
1) I cloned/imaged Disk0 (Western Digital - WD) to Disk1 (Seagate - SG).
2) I then removed Disk0 from the computer. (There was no way to disable the drive in the BIOS).
3) I was then able to boot using F12 to the SG. (Important Side Note: when I removed the WD, the SG was assigned Disk0) At this point I figured everything was good. I have a MBR on the SG!
4) I then plug in my WD. WD gets assigned Disk0, SG gets assigned Disk1. I then was able to boot using F12 into the WD (looking really good!).
5) I then use F12 to go back to boot into Disk1...BSOD. STOP : 0x0000007B (I try again BSOD, I try again BSOD...I quit).
6) I then remove the WD. This causes the SG to get Disk0 and I can then boot into the SG using F12

So at this point I can only boot using F12 into either disk if it is assigned Disk0. It seems Windows 7 is sensitive to Disk numbering.

Given this is a pain to have to physically remove disks, I then proceed to do the following:
1) I put the WD (Disk0) back into the laptop.
2) I boot into WD (Disk0). I look at Disk Management. It shows me that Disk1 is offline. Interesting. I change it to online.
3) I reboot into Disk1. It does not BSOD this time. However the drive letters are incorrectly assigned. Even though I booted using Disk1, the boot partition is assigned E:. I use regedit to swap the letters around and I reboot into Disk1 and it seems ok.
4) I then reboot into Disk0 and its drive letters are all screwed up. It seems Windows does not like having 2 disks with MBRs with a C: drive. On booting Disk0 it seems to notice that Disk1 has a C: drive and relabels the partitions on Disk0.
5) I reboot into Disk1, change C: back to E:
6) Reboot into Disk 0, and the boot partition is now correctly labeled C:. Phew!

At this point I am thinking that using F12 to boot into 2 different devices with Windows 7 (and getting the drive letters correct) is not supported. Not sure if anybody has this working?

My System SpecsSystem Spec

 Disk 2 Does Not Boot OS When Selected as the Boot Device on Startup

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