/* set min sync period at 160 ns and max offset at 8 */
#define PERIOD 40
#define OFFSET 8

int             test_unit_ready(int drive);
int             drive_info(int drive, ubyte *buffer);
int		d_rw(int read_cmd, int drive,
		     uquad block, uword number,
		     ubyte *buffer);
int             sync_neg(int drive);
int             format_unit(int drive);
void            get_drive_info(void);
int		d_mode_sense(int drive, int page, int length, 
			     ubyte *buffer);
int		request_sense(int drive, ubyte *buffer);