BCDEDIT - How to Use

Using native virtualization (VHDs) on Windows 7 (x64, Ultimate).

About to perform clean install - again - to try and fix NVIDIA 'Optimus not working' issue
(2gb Geforce GT540M - GPU load always 0%)

System comparison:

System A: 60 gb. old. lots of problems... but optimus works. terrible performance, attributed to wrecked registry and unoptimised status... looking at bcdedit entry, there is no option for detecthal. is this unusual?

Code:

identifier              {c68e3ca4-3b85-11e4-9658-92feb1b9abaf}
device                  vhd=[D:]\vhd\timmy.vhd,locate=custom:12000002
path                    \Windows\system32\winload.exe
description             Timmy!
osdevice                vhd=[D:]\vhd\timmy.vhd,locate=custom:22000002
systemroot              \Windows
resumeobject            {bbed71cb-3b3a-11e4-ac6a-806e6f6e6963}

on most builds I have these options typically...

Code:

Windows Boot Loader
-------------------
identifier              {c68e3cb2-3b85-11e4-9658-92feb1b9abaf}
device                  vhd=[D:]\VHD\Jim (TEST!).vhd,locate=custom:12000002
path                    \Windows\system32\winload.exe
description             Jimmy: TESTER!
locale                  en-US
osdevice                vhd=[D:]\VHD\Jim (TEST!).vhd,locate=custom:22000002
systemroot              \Windows
resumeobject            {bc23dd48-8055-11e4-9dfe-806e6f6e6963}
bootux                  Basic
detecthal               Yes

but I've just noticed that Build A (Timmy) - the one with working nvidia config - doesn't have BCDEDIT options that others do, and wondered if this could be preventing NVIDIA GPU from being used


looking at drivers on new builds vs drivers on old no difference - comparing nvidia's system info reports showed that build A has an "nvidia update" entry, whilst all new builds are missing this... also, Build A has an "NVIDIA Drivers" Entry in Programs & Features that isn't present in others...

any insights on BCDEDIT entries and specific intel/nvidia install instructions would be great. contemplating the windows 8 plunge...

Hi, is it possible to achieve the following using BCDedit

System has a dual boot, both win 7, 2 partitions

I forgot the password to one of the Win 7 Install so I can't log into it BUT THIS IS THE OS I NEED TO KEEP

From the accessible Win 7, can I use BcEDIT to make the other OS the primary and delete the old one?

don't ask me why I need to do this, it's a long story.

So for these commands:

bcdedit /create {ntldr} /d "Windows XP"

bcdedit /set {ntldr} device partition=F:

bcdedit /set {ntldr} path \ntldr

I replace {ntldr} with {bootmgr}, or is it a different syntax?