![]() Copies, io.sys and msdos.sys from boot medium to the drive being formatted, and makes the destination drive bootable by writing to that drive's master boot record. s = Copy system files, write master boot record. Useless today, but for compatibility with older programs, doesn't complain about it. The /u switch bypassed the image creation, speeding up the format process. There used to be a command called unformat that would allow you to undo a format of a floppy, provided it made a backup image of that floppy. This is the easiest and quickest way to erase everything on a particular drive. A lot of tech support places will refer to this as a debug, as we often use the debug(.exe) command to do this. Low level format erases the MBR, the partition table, everything. (This is coming from someone who's used DOS since MS-DOS 3.3 was state of the art, and a former Product Specialist (L2) for Dell, who had to explain this all day every day to people).
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