diskutil eraseDisk HFS+ newdisk disk1

NOTE: NEW DISK IS THE NAME FOR THE NEW DISK
NOTE: DISK1 IS THE MOUNT POINT->THIS WILL NOT ALWAYS BE DISK1
TIP: DO THIS UNDER SUDO
NOTE: THIS WILL GIVE YOU AN ERROR BUT WHEN YOU PUT THE DEVICE BACK IN IT WILL BE READY AND OKAY



TIP: REPLACE [] WITH STANDARD HYPERTEXT PROTOCOL.
TIP: REPLACE WHATEVER IS BETWEEN THE [] WITH YOUR INFORMATION.



Hope that helps!