How to increase size of Bootcamp partition

[mindquest]

Catalina 10.15.7
iMac (Retina 5K, 27-inch, 2020)
4TB internal SSD

Current Bootcamp partition: 200GB

I need to increase the Bootcamp partition to 500GB (running Win 10) but when I look at disk utility on the Bootcamp drive it says "This volume can't be resized"

Am I just in the wrong area to resize the Bootcamp drive?

Any help is appreciated!

 

[mindquest]

Running thru countless Youtube videos and so far no solution. Arg!!

 

[DeltaMac]

Problem is that you have two, very different, boot partitions.
The Windows solutions with various Windows utilities to increase the size, often ends up ruining the boot capabilities of the macOS boot partition.
And, the Mac's Disk Utility can't make changes to the Windows partition, because it's an NTFS format, that the Mac can't modify.
One method would be to back up your Windows partition, using one of several different windows tools, such as WinClone, then boot to your Mac system, run the Bootcamp assistant, then delete your Windows partition. Bootcamp will do that for you. Restart your Mac, then run Bootcamp assistant. Make the partition size as you need it. Reinstall Windows, restore your files with WinClone (or whatever you have used for a backup)

 

[mindquest]

Problem is that you have two, very different, boot partitions.
The Windows solutions with various Windows utilities to increase the size, often ends up ruining the boot capabilities of the macOS boot partition.
And, the Mac's Disk Utility can't make changes to the Windows partition, because it's an NTFS format, that the Mac can't modify.
One method would be to back up your Windows partition, using one of several different windows tools, such as WinClone, then boot to your Mac system, run the Bootcamp assistant, then delete your Windows partition. Bootcamp will do that for you. Restart your Mac, then run Bootcamp assistant. Make the partition size as you need it. Reinstall Windows, restore your files with WinClone (or whatever you have used for a backup)

Thanks for the confirmation on what I have read on other forums.