Question Boot partition is on another drive ?

Jul 18, 2025
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Saw this post for my current problem (https://forums.tomshardware.com/threads/boot-manager-is-in-another-drive.3782086/post-22832666)
On my side the PC won't boot if a 240G SSD is not plugged.
Following the selected solution steps to remove the boot drive from my 240G drive and put it on my C: drive (NVME), I'm facing the following error at "delete partition override": The arguments specified for this command are not valid. For more information on the command type: HELP DELETE PARTITION.

Here's my drives list: View: https://imgur.com/a/JYONTBR


Disk 2 is the one with the unwanted boot partition and disk 3 my main drive (yeah it's obvious, I know 😉)

Thanks in advance for you help!
 
Easiest fix: Unplug all other drives, except OS drive, format your OS drive and make a new, clean Win installation.

This way, with only one drive connected, Win is forced to put the boot manager on OS drive, fixing your issue. Afterwards, once you can boot to OS again, connect all your other drives and format your 240GB drive, to get the old boot manager and different partitions off from it.
If you have personal data on OS drive, you can house them temporarily on your 2TB D:/ drive which is mostly empty.

Moving forwards, don't install Win when you have more than 1 drive connected. Since Win loves to put boot manager on another drive, other than OS drive (for redundancy purposes). But it leads to a stupid situation, where you have to have two drives connected when you want to boot to OS, just like you currently have it.
 
Following the selected solution steps to remove the boot drive from my 240G drive and put it on my C: drive (NVME),
I'm facing the following error at "delete partition override": The arguments specified for this command are not valid.
Execute from elevated command prompt.
If you get any errors, then stop immediately and show screenshot.

diskpart
list disk
select disk 3
(select OS disk containing partition C: )
list partition
select partition 3
(select 546MB recovery partition)
delete partition override
create partition efi
format fs=fat32 quick
assign letter=H
exit
bcdboot C:\windows /s H: /f UEFI

Boot into BIOS and
change boot priority to boot from Boot Manager on 1TB drive.
Boot into windows and verify, it boots normally.
After that you can remove 240GB drive.

https://www.minitool.com/news/elevated-command-prompt.html
 
Execute from elevated command prompt.
If you get any errors, then stop immediately and show screenshot.

diskpart
list disk
select disk 3
(select OS disk containing partition C: )
list partition
select partition 3
(select 546MB recovery partition)
delete partition override
create partition efi
format fs=fat32 quick
assign letter=H
exit
bcdboot C:\windows /s H: /f UEFI

Boot into BIOS and
change boot priority to boot from Boot Manager on 1TB drive.
Boot into windows and verify, it boots normally.
After that you can remove 240GB drive.

https://www.minitool.com/news/elevated-command-prompt.html
Hi Skynet, I've followed your steps and I'm facing the following error at "delete partition override": The arguments specified for this command are not valid. For more information on the command type: HELP DELETE PARTITION.
 
Not easiest at all. And completely unnecessary.
Just say - you don't know, how to solve this.
It is easiest. And can be fastest as well, given that there are issues with other methods. Just like OP had by following your fix. 🙄

What i suggested, is confirmed to work fix. Sure, one may loose personal data on OS drive, but one can back up personal data beforehand, as i described.
Also, starting from fresh Win install is always a good thing, since it gets rid of other software issues. Or are you arguing against it? 🤔

I'm looking forward on how you solve the error of "delete partition override" OP got.
 
It is easiest. And can be fastest as well, given that there are issues with other methods. Just like OP had by following your fix. 🙄

What i suggested, is confirmed to work fix. Sure, one may loose personal data on OS drive, but one can back up personal data beforehand, as i described.
Also, starting from fresh Win install is always a good thing, since it gets rid of other software issues. Or are you arguing against it? 🤔

I'm looking forward on how you solve the error of "delete partition override" OP got.

Error in format command.
There must be a space symbol between "fat32" and "quick"
format fs=fat32 quick

Redo it all.
This time with proper syntax commands.
And show screenshot.
 
Error in format command.
There must be a space symbol between "fat32" and "quick"
format fs=fat32 quick

Redo it all.
This time with proper syntax commands.
And show screenshot.
Ah classic! Redid everything and it worked like a charm, thanks again for your time and knowledge!
It is easiest. And can be fastest as well, given that there are issues with other methods. Just like OP had by following your fix. 🙄

What i suggested, is confirmed to work fix. Sure, one may loose personal data on OS drive, but one can back up personal data beforehand, as i described.
Also, starting from fresh Win install is always a good thing, since it gets rid of other software issues. Or are you arguing against it? 🤔

I'm looking forward on how you solve the error of "delete partition override" OP got.
You're solution is not bad and explained the reason why I had the issue, but it's a lengthy process to redo everything after a format compared to this which was a 5 minutes job, thanks for your input and never under estimate the user errors XD
 
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