Usually, external disks are already formatted, so the only thing you must do is plugging the USB port to your computer and you’re ready to use the drive.
However, with the Disk management tool included in Windows you can modify partitions and reformat the disk as you like
Once you connect the disc through the USB port, go to the desktop, right click on “MyComputer” and select [B]Manage[/B].
From there, select “[B]Disk management[/B]”. Here you can see all installed disks.
Select the drive you want to modify and partition it as you like