function GetDiskVolSerialID( cDriveName : char ) : DWord;
var dwTemp1, dwTemp2 : DWord;
begin GetVolumeInformation( PChar( cDriveName + ':\' ), Nil, 0, @Result, dwTemp2, dwTemp2, Nil, 0 );
end;

MessageDlg( 'Serial number: ' + Format( '%X', [ GetDiskVolSerialID( 'E' ) ] ),
mtInformation, [mbOk], 0 );

DELPHI - 7

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