I want to delete my time machine backup folder. I have other files on the disk and can not reformat. In the past, I have dragged the folder to the trash, and even though that worked, the process have sometimes taken hours, and on an old powerbook, it took more than 24h. Right now I'm trying the terminal command sudo rm -rf. My aim was to save time by bypassing the trash. But the process has been going on for about 30 min already, and I see "Operation not permitted" after many or most of the lines. Does anyone know what that means? What is the fastest way to just delete a time machine backup folder. Surely there must be a way of deleting a folder instantly, without the OS having to go through and verify every file?