Create a USB recovery drive or an installation CD/DVD or USB memory stick with the operating system that you want to use next, and boot from it. Choosing to boot from a CD in the BIOS/UEFI Boot Menu Then, on the recovery screen or during the installation of the new operating system, select the existing Windows 11 or Windows 10 partition and format or delete it. Remember, this will erase all the data you have on that partition. Deleting a Windows partition Alternatively, you can boot from the recovery or install drive, load Command Prompt (Shift + F10), and then use the diskpart and format commands to remove or format the Windows partition(s) you no longer need. If you want to uninstall Windows 11 or Windows 10 like this and need guidance on how to use diskpart and format, follow the steps described in this tutorial: How to use diskpart, chkdsk, defrag, and other disk-related commands.
