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Detect a CDROM drive

 

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NOTE:
This code does not work anymore in Windows 2000 or Windows XP.
See the other tip listed at the top for all newer Windows versions.

Test for example IsCDROM(4) to see, whether 'e:' is a CDROM drive.
Drives are mapped like this:
  • a: -> 0
  • b: -> 1
  • c: -> 2
  • etc. 

function IsCDROM(Drive: Integer): Boolean; assembler;
Asm
  MOV	AX,1500h { look for MSCDEX }
  xor	BX,BX
  INT	2fh
  or	BX,BX
  JZ	@Finish
  MOV	AX,150Bh { check for using CD driver }
  MOV	CX,Drive
  INT	2fh
  or	AX,AX
  @Finish:
end;

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