INT 21 - DOS 5+ - DISABLE DRIVE AX = 5F08h DL = drive number (0=A:) Return: CF clear if successful CF set on error AX = error code (0Fh) (see #01680 at AH=59h/BX=0000h) Notes: simply clears the "valid" bit in the drive's CDS this function is not supported by Novell DOS 7 through at least Update 4, but support was added by Update 13 SeeAlso: AH=52h,AX=5F07h"DOS"