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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
See Also: AH=52h - AX=5F07h"DOS"
Category: DOS Kernel - Int 21h - D
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