Windows 10: when shrinking my C: drive to create a partition, I shrink button greyed out more info

As seen above I am able to enter the shrink C: drive menu, but no matter the amount I put in currently at 20gb seen in photo the shrnk button is greyed out. None of the other boxes are editable.

:)

 

W10 Partition shrinking/expanding

Recently expanded my 'System Reserved' partition in order to install W10 1903 release.

However, expanded it by far too much, so now need to shrink and reallocate to may main Drive C .

If I shrink, will the newly unallocated space automatically be placed next to my Drive C (so as to allow me then to extend my main Drive C partition?

 

How shrink the big C:\

Hello all:

I have a w10 of HP 15-au123d.

I am going to do clean-installation. Before that I want to reduce/shrink

the 488 GB big C:\ partition.

I open the "Create and format hard disk partitions" and right-click the

c:\ partition and click "shrink" It says:

Size of available Shrink Space 0

How can I shrink/reduce this so big partition? -- Zhao

[Moved from: Windows / Windows 10 / Windows settings]

 

C drive Shrinking problem

Hi i cant seem to shrink my C drive partition when I try an error message is displayed "The Parameter Is Incorrect" The C drive Partition is on a SSD card and It has 45GB of free space left over Im not sure on what to do...