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Operating system not found on boot device or boot sector bad (either hard or floppy disk)
Explanation: The system found a boot device--either a floppy disk or a hard disk--and tried to boot it, but could not start the operating system because the operating system files are not on the booted volume.
Diagnosis: The most common cause of this problem is trying to boot a non-bootable floppy or hard disk, that is, a disk that has not been made bootable using the "FORMAT /S" or "SYS" commands. If this occurs on a disk that was already prepared to be bootable, it means that the operating system startup files have become corrupted.