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Probably a recovery partition behind your C: partition. Can you share a screenshot of Disk Management?

yes I have

I have this issue at times when other provision things without modifications. I use disk part. I can send you what I have if you are interested

Okay

Says MCS, But it really for any WIndows OS

For me it looks like this

This disk part option still applies.

Ok

Or use the tool In the CTX article. There are numerous free tools that will do this. When I build servers or machines I rearrange the Patitions before I start using it in whateve Solution it’s going In.

Had this for a customer 2 weeks back, ended up doing a re-build, as the diskpart method didn't work. That being said, try the diskpart method @Ray Davis has provided, i've had it work half the time i've tried it, worth it in a coin toss! Else, you'll want to look at using a paid third party partition mgmt tool from Paragon or EaseUS

I wonder is Macrium Reflect (free version would help)

Thanks @Ray Davis i followed your doc it worked for me

@Ray Davis, i tried "Macrium reflect" just now to extend some of my windows golden images on my lab, didn't work, however, I found a method to do it via gparted! Will create a blog on it soon

Nice man. Never used gparted. Will be interesting to read that

done! Complete with Billy Mays (rip) reference https://getvpro.wordpress.com/2022/09/01/extending-os-drives-on-efi-based-systems-the-ez-way/