Flash drive shows 11 different usb drives

If you want to format it run in the command promp and right “DISKPART” then right “LIST DISK” then right “SELECT DISK K” that “K” that I rote is not rely what you should right it is just an example so whatever the letter of your flash drive is type that in instead of the K

Usually you see that when you burn an IMG file onto the flash drive.

You can either delete the partitions manually via disk management which takes ages. Or clear the selected disk (diskpart lists them as disk numbers you can find number in disk management).

In command prompt as administrator you type diskpart then list disk, then select disk X (replace d with number), then type clean and then reinitialise disk in disk management.

This is if you don't need to backup the flash drive.