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AH = 49h DL = drive number
Return:
CF clear if media has not changed AH = 00h CF set if media may have changed AH = 06h (see #00234)
Note: Unlike AH=16h, any drive number may be specified
See Also: AH=16h - AH=41h"INT 13 Ext" - AH=46h
Category: Disk I/O Enhancements - Int 13h - I
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