I can see using it to clear the Master Boot Record that may have a virus in it. But could someone explain why you would need to use this switch and perhaps give me an example.

A master boot record (often shortened as MBR) is a kind of boot sector stored on a hard disk drive or other storage device that contains the necessary computer code to start the boot process.

A friend of mine asked me to fix his USB flash drive. It's an HP 4GB drive. My notebook is running Windows 7 64-bit. When I connected the drive to my computer, Windows installed the drivers but it ...