Hi Repkodan, and welcome to TSG.
The exact method would depend on the operating system running on the computer and if it is the system boot drive or a secondary or external drive. If it is not the boot drive, and you are running a recent version of Windows, you should be able to right click on it in Windows Explorer and choose "Format" from the menu.
The exact method would depend on the operating system running on the computer and if it is the system boot drive or a secondary or external drive. If it is not the boot drive, and you are running a recent version of Windows, you should be able to right click on it in Windows Explorer and choose "Format" from the menu.