I currently have a 600gb disk, with Ubuntu installed, 600gb of which is given to the Ubuntu OS:
Filesystem Size Used Avail Use% Mounted on /dev/sda1 592G 16G 547G 3% / udev 1.9G 4.0K 1.9G 1% /dev tmpfs 777M 944K 776M 1% /run none 5.0M 0 5.0M 0% /run/lock none 1.9G 3.8M 1.9G 1% /run/shm
Is it safe to unmount /dev/sda1 to shrink it to say, 300gb will I simply be able to remount it afterwards, or is it going to break everything and just die? Using Gparted?
If not then, how does it work in Windows Disk Manager, there I am able to resize mounted disks?