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Therefore this problem does not occur with these older operating systems. With MS-DOS and Windows 95, you do not have to set the media descriptor byte. The media descriptor indicates the type of medium currently in a drive. Older product disks may also not have the media descriptor byte. Some older preformatted floppy disks do not contain a media descriptor byte. This problem occurs on disks that do not contain a media descriptor byte in the BIOS parameter block (BPB) of the boot sector. The same disk may work correctly with MS-DOS or Windows 95, or after you re-format the disk with Windows 98, Windows Millennium Edition, Windows NT, Windows 2000, Windows XP, or Windows Server 2003. STOP: The disk media is not recognized, it may not be formatted.
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