Wipe off the USB drive
Windows
Mac
Open Disk Utility:
Go to Applications > Utilities > Disk Utility.
Select Insert the USB drive.
Open Terminal.
Find the location of the USB drive:
Insert the USB drive.
On the left side-bar, there should be an External section. The USB drive should be listed under this section. To verify that you have correctly identified the drive, you can unplug and re-insert the drive while observing if the listing disappears and reappears.
Select the drive from the left side-bar.
...
Type in the following command to list all the drives. This should show a listing of the different drives.
Code Block diskutil list
Find your USB drive in the list (it will be something like
/dev/diskX (external, physical)
where X is the number assigned to your USB drive. Look at the size of the drive to verify that it is the correct drive.
Before erasing, you may need to unmount the drive.
Erase the USB drive:
Click the Erase button at the top of the window.
Type a label for the drive into the Name field.
In the Format field, select
MS-DOS (FAT)
.Click the Erase button.
...