Updated July 21, 2017 Make sure you have a bootable floppy disk or CD. Insert the disk into the computer, and turn it on. The computer will boot to a black screen showing only an “A:>” prompt or a prompt indicating the letter of the drive you booted from. You can also accomplish this by rebooting your computer with the disk in the drive. Type “format c: /s” and hit “Enter.” The formatting process will begin. Hit “Y” on the keyboard for “Yes” when asked “Are you sure you want to erase everything on drive c:,” and then press “Enter.” Remove the disk, and reboot your computer. It will boot to the “C:>” prompt from the hard disk. If you don’t have a bootable floppy disk or CD, create it by inserting a blank disk into your computer and typing “format a: /s” from the C:// prompt on your computer before beginning the process. “A:” can be replaced by the letter for whatever drive you are using to begin the reformatting process. Writer Bio
