how to format a usb without deleting everything

Keep holding down the shift key while clicking Restart. Hold down the shift key on your keyboard while clicking the Power button on the screen. If your Windows 10 installation can make it to the sign-in screen, but you cannot load the desktop, you can still boot into the recovery environment. Option 2: Load the Recovery Environment at the Sign-In Screen The rest of the process is just like performing a new install of Windows 10. Upon the third try, Windows will load into the recovery environment. Immediately when the Windows 10 splash screen appears, power off the system. Press the power button to start your computer. This is the most common method because it can be used when you can’t boot to the Windows 10 sign-in screen or desktop.

Option 1: Load the Recovery Environment When You Start Your Computer There are several ways you can boot into it. The advanced recovery environment is used to resolve problems that might prevent your Windows 10 installation from starting.

Perform a Clean Install Using Advanced Recovery Options in Windows 10

How to format a usb without deleting everything