Windows 10: C: drive not on on disk 0 but on DIsk 2..Is that a problem?

Setting up a new desktop computer for the 1st time (and also adding an old HDD that didn't work) I have 3 drives. The main drive, which is a nVme SSD, and where my OS is (Windows 10) somehow, according to what I see under Computer Management, ended up on DIsk 2, my secondary normal SSD on Disk 1 and Now my newly added HDD Sata on DIsk 0.
Shouldn't the OS which is on C: be on disk 0 and not 2? Is this problematic in any way? And can it be changed without causing problems or without a new install of Win10?

Win 10 latest version (can't give you the exact version number since the computer in question is running tests and I am writing to you form my laptop)

:)

 

Cannot merge C drive (disk 0) with unallocated space (on disk 1)

Hi all,

I need some advice on whether it is possible - and if yes, how to merge my C drive on disk 0 with D drive on disk 1.

The problem is: my C drive is getting full soon, but previously after I deleted D drive and make it unallocated space (the bar of current D drive will change to black from blue), I still cannot expand C drive by adding the 100GB unallocated space into it.
If I right click on C drive, the "expand" item is in gray.

I've searched online for solutions but so far only have seen same questions around. Does any one know the solution and do a big favor to explain how to do it step by step? Thanks much in advance!

P.S, sorry that the interface is not in English. Below page shows the "Disk Management" function, and you can see that:

1) Disk 0 has 55.78G, including C drive (55.21GB), 100MB of something I don't know what it is, and 473MB of recovery zone

2) Disk 1 has 100GB D drive, and 831.51GB E drive

 

Cannot merge C drive (disk 0) with unallocated space (on disk 1)

You cannot combine space from two separate physical disks. You have two choices:

1. Replace your C drive (disk 0) with a larger disk, or

2. Move some of the files from the C drive to a D drive on disk 1. Be very careful moving files from C to D; moving the wrong files can render your PC inoperable.

 

Windows 10 Disk Management - cannot extend C: drive to allocated space

Hello, I followed all of the steps listed and it is still not working. The issue may be that the unallocated space is located on Disk 1 when my C: drive is on Disk 0 and I cannot seem to get them both on the same disk. Do you know if there is a solution
for this?