Forum Thread

change drive letter in bios?

RUsum1 9,544 1,696 February 29, 2012 at 03:17 PM
Somehow my Windows drive has changed from C to G so my computer isn't booting because it's not finding the proper drivers. Is there a way to change it back from within the bios? I can't get into windows to change it that way. I do have a Windows 7 Installation image on a USB stick if that is necessary.

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#2
Quote from RUsum1 View Post :
Somehow my Windows drive has changed from C to G so my computer isn't booting because it's not finding the proper drivers. Is there a way to change it back from within the bios? I can't get into windows to change it that way. I do have a Windows 7 Installation image on a USB stick if that is necessary.
Bios does not assign drive letters, that is a "windows" thing. What happens when it try's to boot? do you have any other hard drives, usb keys, cds in the computer? I would not be surprised if you boot device got changed to something else (different hard drive, usb, phone).
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#3
Agreed, BIOS doesn't assign drive letter.
How do you know the drive letter changed to G:? Are you in another OS on the machine that shows it as G:? What error message are you getting?
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#4
See if you can log in safe mode.

How to restore the system/boot drive letter in Windows

http://support.microsoft.com/kb/223188

Windows 7 Won't Boot - Reassigns drive letters and removes drive information.

http://answers.microsoft.com/en-u...6d07cb0b2c
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Last edited by evongugg February 29, 2012 at 03:41 PM
#5
Quote from RUsum1 View Post :
I do have a Windows 7 Installation image on a USB stick if that is necessary.
In that case, you could boot up from the USB stick and go to "Repair".
It will see any Win 7 installations and attempt to fix the boot problem.
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#6
It goes to this system repair screen for a little while and then says it can't boot. I was able to look at some sort of log and while I didn't understand most of it I did notice a line that said it failed to load a certain driver but the path given was G:/windows/system32/etc.etc.etc

When I booted to my Windows 7 USB I clicked on the repair link instead of install or whatever and it listed my OS drive but that also shows my Windows drive as being G:/

I tried to do a system recovery from the computer itself and from the USB device but it tells me that I didn't set a restore point so it doesn't do anything.

I do have multiple hard drives but none of them have Windows on them.

I'll have to try booting into safe mode although I'm not optimisitc that it will work
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#7
Quote from RUsum1 View Post :
It goes to this system repair screen for a little while and then says it can't boot. I was able to look at some sort of log and while I didn't understand most of it I did notice a line that said it failed to load a certain driver but the path given was G:/windows/system32/etc.etc.etc

When I booted to my Windows 7 USB I clicked on the repair link instead of install or whatever and it listed my OS drive but that also shows my Windows drive as being G:/

I tried to do a system recovery from the computer itself and from the USB device but it tells me that I didn't set a restore point so it doesn't do anything.

I do have multiple hard drives but none of them have Windows on them.

I'll have to try booting into safe mode although I'm not optimisitc that it will work
Instead of trying to do the restore, do the repair.
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#8
What you can do is boot to your USB. After choosing language choose repair this computer, and get to command line. Once in command line type:

diskpart

once the diskpart loads type:

list volume

Find the drive you want to be C: then type:

select volume G: (or what ever drive you want to be C: )

Then type:

active

This will make the drive you selected the active(C: ) drive

It takes a restart to see the change in diskpart. If it is still not booting try typing the following in command line when boot from cd (usb)

bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
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Last edited by Draino March 1, 2012 at 12:09 AM

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#9
Quote from Draino View Post :
What you can do is boot to your USB. After choosing language choose repair this computer, and get to command line. Once in command line type:

diskpart

once the diskpart loads type:

list volume

Find the drive you want to be C: then type:

select volume G: (or what ever drive you want to be C: )

Then type:

active

This will make the drive you selected the active(C: ) drive

It takes a restart to see the change in diskpart. If it is still not booting try typing the following in command line when boot from cd (usb)

bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
Agreed. I was hoping to keep it simple by having the OP try Windows' own automatic boot repair, but yours is the sure fire way of getting that machine booted up.
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#10
Quote from Draino View Post :
What you can do is boot to your USB. After choosing language choose repair this computer, and get to command line. Once in command line type:

diskpart

once the diskpart loads type:

list volume

Find the drive you want to be C: then type:

select volume G: (or what ever drive you want to be C: )

Then type:

active

This will make the drive you selected the active(C: ) drive

It takes a restart to see the change in diskpart. If it is still not booting try typing the following in command line when boot from cd (usb)

bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
just tried the first part but now nothing loads and I get a black screen that says missing boot manager or something (can't remember). Loaded from the USB and now it showed a screen to repair something so I chose that then when it loaded from the USB again it showed Windows now on my C drive but when I boot without the USB drive I still get the missing boot manager screen.

When I get home from work I'll have to try that bootrec stuff to see if that works.
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#11
Quote from RUsum1 View Post :
just tried the first part but now nothing loads and I get a black screen that says missing boot manager or something (can't remember). Loaded from the USB and now it showed a screen to repair something so I chose that then when it loaded from the USB again it showed Windows now on my C drive but when I boot without the USB drive I still get the missing boot manager screen.

When I get home from work I'll have to try that bootrec stuff to see if that works.
use fixmbr command to recreate the master boot record.
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#12
just tried that bootrec stuff. all three said operation completed but the last one said something about seeing zero windows installations for some reason. here are some pictures i took with a camera before i did the diskpart command lines. hopefully someone will see something that can help. this was when it showed my windows being the g:/ drive.


edit: pictures 5, 7, and 6 show what my computer is doing now. I booted again with the USB after doing the bootrec stuff and chose system repair. I thought it fixed something because it prompted me to restart again but it's still doing the same stuff. that fvevol driver is what was showing as corrupt before but the path was with the letter G instead of C. I thought that was the reason I was getting the error. after doing repair again, the system still won't start but the report says OS booted successfully (picture 6). doing repair doesn't seem to help anything at this point. not sure what else to do

edit 2: please let me know if any of the info in my pictures should be kept secret. I'm not sure what info I'm providing so I don't want to give info for others to hack my computer if I get this fixed

Quote from nizzy1115 View Post :
use fixmbr command to recreate the master boot record.
so I do all three commands or just the fixmbr? i tried all three and after the last one the prompt said something about no windows installations detected (even though it boots to this windows stuff without the usb device plugged in)
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Last edited by RUsum1 March 1, 2012 at 03:23 PM
#13
Quote from RUsum1 View Post :
just tried that bootrec stuff. all three said operation completed but the last one said something about seeing zero windows installations for some reason. here are some pictures i took with a camera before i did the diskpart command lines. hopefully someone will see something that can help. this was when it showed my windows being the g:/ drive.


edit: pictures 5, 7, and 6 show what my computer is doing now. I booted again with the USB after doing the bootrec stuff and chose system repair. I thought it fixed something because it prompted me to restart again but it's still doing the same stuff. that fvevol driver is what was showing as corrupt before but the path was with the letter G instead of C. I thought that was the reason I was getting the error. after doing repair again, the system still won't start but the report says OS booted successfully (picture 6). doing repair doesn't seem to help anything at this point. not sure what else to do

edit 2: please let me know if any of the info in my pictures should be kept secret. I'm not sure what info I'm providing so I don't want to give info for others to hack my computer if I get this fixed


so I do all three commands or just the fixmbr? i tried all three and after the last one the prompt said something about no windows installations detected (even though it boots to this windows stuff without the usb device plugged in)

It sound like you have a driver issue and not a mbr or bcd issue. I suggest running and sfc scan and a chkdsk to do this get to command prompt again and type:

c: (to change to drive letter from x: to drive having problems)

sfc /scannow /offbootdir=c:\ /offwindir=c:\windows

If this doesn't fix the problem then run a chkdsk:

C:
chkdsk /f

It will say the drive is currently locked, just answer yes to unlock it.

On a side not have you tried booting with last known good configuration? If not I would try this first.
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#14
Quote from Draino View Post :
It sound like you have a driver issue and not a mbr or bcd issue. I suggest running and sfc scan and a chkdsk to do this get to command prompt again and type:

c: (to change to drive letter from x: to drive having problems)

sfc /scannow /offbootdir=c:\ /offwindir=c:\windows

If this doesn't fix the problem then run a chkdsk:

C:
chkdsk /f

It will say the drive is currently locked, just answer yes to unlock it.

On a side not have you tried booting with last known good configuration? If not I would try this first.
I tried a system restore but I never set a restore point so that didn't work. I didn't notice another option of "last known good configuration" or anything like that

edit: sfc says "windows resource protection found corrupt files but was unable to fix some of them".

edit 2: chkdsk finished really fast (not sure how long it's supposed to take). says "windows has checked the file system and found no problems".
...so now what? there is no way to reload that specific driver somehow? how does one driver go bad?
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Last edited by RUsum1 March 2, 2012 at 07:40 AM
#15
Quote from RUsum1 View Post :
I tried a system restore but I never set a restore point so that didn't work. I didn't notice another option of "last known good configuration" or anything like that

edit: sfc says "windows resource protection found corrupt files but was unable to fix some of them".

edit 2: chkdsk finished really fast (not sure how long it's supposed to take). says "windows has checked the file system and found no problems".
...so now what? there is no way to reload that specific driver somehow? how does one driver go bad?
have you check the bios to make sure its loading the right device in the right order?
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