[SOLVED] Cannot boot Windows 10 without CSM enabled ?

[Arupendra]

I installed windows 10 on my PC. And after that when I disabled CSM on BIOS, my pc boots to BIOS. I'm new to these things. And there is also a post similar to this but I was unable to understand that. Btw here is the screenshots in the Disk management. And my disks in disk management is different from the one I had seen here before.

https://imgur.com/a/4CdyRNq

View: https://imgur.com/a/4CdyRNq

 

[dwd999]

I installed windows 10 on my PC. And after that when I disabled CSM on BIOS, my pc boots to BIOS. I'm new to these things. And there is also a post similar to this but I was unable to understand that. Btw here is the screenshots in the Disk management. And my disks in disk management is different from the one I had seen here before.

https://imgur.com/a/4CdyRNq

View: https://imgur.com/a/4CdyRNq

It appears that you had more than 1 drive connected at the time you installed Windows. The Windows installer really does not work well in such situations. It would be best if you were to reinstall windows with only 1 drive connected; your second drive can be connected after installation is complete.

 

[Arupendra]

It now looks like this.

https://imgur.com/a/4CdyRNq

View: https://imgur.com/a/4CdyRNq

 

[Arupendra]

and any way to do it without reinstalling windows?

 

[Colif]

Why did you disable csm?

reason it won't boot after that is your drives are formatted as MBR and by disabling CSM it is unable to boot that format. Turn it back on and windows will work.

Spoiler

Explanation of terms:


UEFI - Unified extensible Firmware Interface
If your PC is less than 11 years old, you have a UEFI bios now

In 2006 or so Intel decided the bios as it was at time was too limited and needed to be replaced so that it supported newer technologies as they were invented
By about 2009 a consortium of hardware makers had combined to create UEFI standard

Old bios were limited,

• they didn't know what a mouse was for, so everything was keyboard driven
• they weren't expandable, everything had to fit in a small amount of memory
• they only supported Master Boot Record (MBR) which can only have 4 partitions per drive (there are tricks to get around this) and max drive size is 2.2 tb

UEFI bios overcame all the limitations of legacy bios (as it came to be called)

• it supports mouse,
• it has a GUI so it looks better than previous bios could
• Its expandable, it can be added to to grow as new hardware is created.
• UEFI supports MBR & GPT Drives

GPT = GUID Partition Table

GUID = Global Unique ID = Every GPT drive on earth has a unique ID
GPT drives can have a max of 255 partitions on them
Max size of a GPT drive/partition is 18.8 million TB

What are you trying to do?

 

[Arupendra]

I did not disable CSM but I want to launch the PC without CSM so I can turn on Resizable Bar and Secure boot (I won't update to windows 11 though)

 

[Colif]

You need to be running GPT to turn on secure boot and probably resizeable bar, I am not sure about the second part.

You can convert C drive to GPT via a windows command but since parts of windows are on 2 drives, it be faster to just reinstall windows 10 with CSM off from the start. It will make it use GPT, its surprising windows 10 didn't insist.

only have 1 drive attached when you do it, makes it put all the partitions on the same place. the 50mb boot partition that remains can be ignored as if you have CSM off, it will never work.

 

[Arupendra]

Okk now Don't worry about it. I tried the previous thread regarding this and it worked. Thanks everyone