MARKCYL - Mark Fixed Disk Cylinder as BAD under DOS
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This program marks a fixed disk cylinder as BAD for
DOS use. All clusters in the FAT which lie on the
specified cylinder are marked BAD.

Command Syntax -

     MARKCYL  drive<:>	{cylinder# | DIAGn}

Notes -

     1. If "DIAGn" is specified, the cylinder which is reported
	by BIOS as the "diagnostic" cylinder is used ... Note
	that this is not the true diagnostic cylinder for
	drives which have more than 1024 cylinders. "n" is
	the BIOS drive number (0 or 1).

     2. This program performs NO function if ANY of the
	clusters on the specified cylinder are in use.