struct ioc_medium

{

	u_int16_t   data_length;

	u_int8_t    medium_type;

#define MST_TYPE_MASK_LOW	0x0f

#define MST_FMT_NONE		0x00

#define MST_DATA_120		0x01

#define MST_AUDIO_120		0x02

#define MST_COMB_120		0x03

#define MST_PHOTO_120		0x04

#define MST_DATA_80		0x05

#define MST_AUDIO_80		0x06

#define MST_COMB_80		0x07

#define MST_PHOTO_80		0x08

#define MST_TYPE_MASK_HIGH	0x70

#define MST_CDROM		0x00

#define MST_CDR			0x10

#define MST_CDRW		0x20

#define MST_NO_DISC		0x70

#define MST_DOOR_OPEN		0x71

#define MST_FMT_ERROR		0x72

};

#define CDIOCGETMEDIUM _IOWR('c',32,struct ioc_medium)