Partition shrink with diskpart does nothing
coresdev
I ran a disk shrink command in DISKPART, to shrink the C: volume 100 GB.
It took over 13 hours, and when I came back, nothing had happened. The volume size was exactly the same, but the operation had completed. There is no new unallocated space.
Here is a screenshot of Disk Management after the command completed. Notice the odd size differences between the graph at the bottom and the list at the top.
gronostaj
First, make sure your backups are up to date. You're dealing with partitions, data loss can occur.
Live-boot some Linux distro with GParted from USB. I like Ubuntu and Pop!_OS for their user-friendliness, GRML is also nice albeit more advanced.
If you see a warning sign next to any partition in GParted, right-click it and choose Check. It will try to fix any inconsistencies, including filesystem size not matching partition size.
Then resize partitions as desired using GParted. Its NTFS support is solid and it's operating offline, which means it can move all structures that would be frozen in place when you're booting from the partition you want to operate on.
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