You can't delete or format the E: volume because it contains the pagefile. Presumably it was moved there because of the shortage of space on C:. You would have to move it to F: first. Performance will be best with the pagefile on the system partition so you should allow adequate space for that when resizing C:.
Use Partition Wizard. That is a lot more flexible than disk management.
MiniTool Partition Wizard | Best partition magic alternative for Windows PC and Server
Right click on the Windows (Start) Icon, click on system.
Advanced System Settings in the column on the left.
Settings button under Perfomance under the Advanced Tab.
Click on advanced tab again. Under virtual memory, click change.
Uncheck the block for "automatically manage paging file size for all drives" if it is checked.
Then highlight each drive and set the options you want.
This is a commonly held myth about pagefiles. On a standard spinny, it can actually reduce performance if a lot of disc access is ongoing on system drive or disk is rather fragmented. It also depends on disk type eg you will get better performance if pagefile is on an ssd (ignoring the other popular myth that you should not have pagefiles on an ssd to maximise ssd life).
Theoretically, the best option is to have 2 SSDs on SATA III connections, one dedicated to OS and programs, and one for the pagefile.
With modern pcs, it is simply best to set paging to auto and let Windows sort it out, in most cases.
Performance will be best if the pagefile is on a separate physical drive. But if there is only 1 drive (as is the case here) then the pagefile should be on the Windows partition. This minimizes head seek time, the major factor in pagefile performance. Pagefile fragmentation is rarely a significant factor. In most cases it isn't a factor at all.
But with a reasonable RAM size pagefile performance usually doesn't matter much anyway.
Interesting thread to take notes.
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