Windows 10: Change of the active partition in windows 10

Hello,I have two windows 10 installed in the same disk, in 2 different partitions.The correct installation is the one that you can see as "New Windows". The other one in volume D: is not needed and I want to remove the whole partition and keep only C:But "D" is the active partition and the system cannot boot without it.If I try to make "C" active, windows are not able to start because they miss some boot files NTLDR is missing etc - the system looks for those file in D:How can I transfer boot files in C: and to be able to boot from C: without the need of D:- I don't want to clone the partit

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Changing active partition

I'm installing a new hard drive (just hard drives, no SSD or anything here), to use as the main Windows partition. When that's done, I want to set it as the active partition, then start moving files from the old partition. But I've never done this before. Is it really as easy as right-clicking the drive in the storage manager, setting as "active partition," and resetting? There are tutorials floating around, but seeing as I'm messing around with hard drives, I'd rather have someone's input.

 

W7 Hard drive partition issue

to get rid of that 100 meg windows partition that setup creates for you on a new install on a blank hdd:

- press shift+f10 when on the partition management screen in setup <-- this opens a command prompt
- diskpart <-- start the windows command line partition management tool
- list disk <--- list the installed hdds in this computer for the next step
- select disk 0 <- might have to replace 0 with the number of the correct disk
- clean <-- this will erase all data on the disk you selected one step up- dont use the wrong disk!
- create partition primary <- creates a primary partition taking up all space on the drive, adjust the command if necessary
- exit, exit to exit diskpart and the command prompt
- click refresh in partition manager and select your newly created partition and install to that

 

unmark a partition as "active"

After changing to active partition my computer doesn't boot so what can I do now?