Verify the floppy diskette you are attempting to read from is not write protected or bad. For floppy read errors see: Why can't my computer read a floppy diskette? Bad floppy diskette Thus, USB attached floppy drives cannot read XDF formatted media.The troubleshooting options and details below are for floppy disk drive issues and not for issues about being unable to read one or two floppy disks.
Floppy disks formatted using XDF can only be read in floppy disk drives that are attached directly to the system by way of an FDC. Floppy distributions of OS/2 3.0, PC DOS 7 and onward used XDF formatting for most of the media set. However, the first cylinder uses standard formatting, providing a small FAT12 section that can be accessed without XDF support and on which can be put a ReadMe file or the XDF drivers. When formatted as XDF disks, 3½-inch floppies can hold 1860 kB, and 5¼-inch floppies can hold 1540 kB, using different number of sectors as well as different sector size per track (not all sectors in the same track are of the same size). It is supported natively by IBM's PC DOS versions and by OS/2 Warp 3 onward, using the XDF and XDFCOPY commands (directly in OS/2). The IBM e Xtended Density Format ( XDF) is a way of superformatting standard high-density 3½-inch and 5¼-inch floppy disks to larger-than-standard capacities.
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