Alternatively referred to as a startup disk or boot disk, a bootable disk contains special files required for the computer to boot into an operating system. If the bootable disk is removable media like a floppy diskette or CD-ROM, it usually bypasses the hard drive, depending on the settings in the BIOS. Commonly this diskette is used to troubleshoot the computer or allow the user to copy files when a computer is down.
What is a no bootable disk error?
If the computer has no bootable media or is trying to boot from media that is not bootable a "No bootable disk", "No bootable device", or similar error is shown. See our bootable device page for further information about this message.