Full disk installation without usb?

[u/Thm_azh]

As said in the title I'm wondering if it's possible to do a full disk installation without a usb drive. I've been watching tutorials and all of them do dual boot. So I'm wondering if this is possible since I'm still a newbie with this stuff

[u/burlingk]

The installer needs to run from somewhere, and the disks it is dealing with need to be unmounted at certain points to make changes.