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Thank you!

How do you do this exactly?

It was a real block device (real from the VM's perspective anyway). Making sure the partitions were of equal size, I ran: dd if=/dev/sda1 of=/dev/sdb1 /dev/sda was the original 4GB disk that I mistakenly increased to 4TB in size. /dev/sdb is the new 8GB disk.

Thanks, what I ended up doing was creating a second 8GB hard disk, re-create the exact partition table, clone the partition from the first disk with dd and reinstalling grub onto the new disk. Then I tested I could boot from it and got rid of the first disk.

I wanted to increase a VM's hard drive size from 4G to 8G. I mistakenly added 4000G, thinking it was 4000M. So the VM thinks there is a 4TB drive now. I couldn't see a way to shrink the size in Proxmox GUI. I read that qemu-img from CLI can do it, but only on raw images. I have qcow2 image...