Windows 10: 253 GB MFI System Partition

Hello! I have a disk partition of EFI system partition that is 253 GB after transferring my OS to a new NVME from my old NVME this one to use as extra storage. I need help on either merging that partition or do a custom reinstall of windows.

:)

 

Excessive 253 GB Disk Usage by Steam

My HD is being consumed by Steam, it is using 253 GB out of 465 GB total, I might only have 157 GB worth of applications,

 

Expanding OS partition

Disk Management shows my OS resided on a 223GB partition (C on an SSD that has 477GB. The SSD has these partitions:

102 MB Unallocated | OS (C 223 GB NTFS Healthy (Boot, Page File, Crash Dump, Primary Partition) | 103 MB Healthy (EFI System Partition) | 253 GB Unallocated

I want to use that 253 of "Unallocated" space. I want to merge it into
OS (C increasing OS (C from 223GB to 477GB all on the same physical SSD.

None of the instructions, and question answers give me any help EaseUS Partition Master
and Microsoft Disk Management both refuse to allow me to change either
OS (C or 253 GB Unallocated.

 

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