DKIOCGMEDIAINFO    The argument to this ioctl() is a pointer
                        to  a  dk_minfo  structure. The structure
                        indicates the type of media or  the  com-
                        mand  set  profile  used  by the drive to
                        operate on the media. The dk_minfo struc-
                        ture  also  indicates  the  logical media
                        blocksize the drive  uses  as  the  basic
|                       unit  blocksize  of operation,   the  raw
|                       formatted capacity of the media in number
|                       of logical blocks and the physical  block
|			size of the media.
			
       /*
       * Used for media info or profile info
       */
       struct dk_minfo {
       uint_t           dki_media_type; /* Media type or profile info */
       uint_t        dki_lbsize;     /* Logical blocksize of media */
       diskaddr_t       dki_capacity;  /* Capacity as # of dki_lbsize blks */
|      uint_t        dki_pbsize;     /* Physical blocksize of media */
       };
       /*
       * Media types or profiles known
       */
       #define DK_UNKNOWN              0x00    /* Media inserted - type unknown */

       /*
       * SFF 8090 Specification Version 3, media types 0x01 - 0xfffe are retained to
       * maintain compatibility with SFF8090.  The following define the
       * optical media type.
       */
       #define DK_MO_ERASABLE          0x03 /* MO Erasable */
       #define DK_MO_WRITEONCE         0x04 /* MO Write once */
       #define DK_AS_MO                0x05 /* AS MO */
       #define DK_CDROM                0x08 /* CDROM */
       #define DK_CDR                  0x09 /* CD-R */
       #define DK_CDRW                 0x0A /* CD-RW */
       #define DK_DVDROM               0x10 /* DVD-ROM */
       #define DK_DVDR                 0x11 /* DVD-R */
       #define DK_DVDRAM               0x12 /* DVD_RAM or DVD-RW */

       /*
       * Media types for other rewritable magnetic media
       */
       #define DK_FIXED_DISK           0x10001 /* Fixed disk SCSI or otherwise */
       #define DK_FLOPPY               0x10002 /* Floppy media */
       #define DK_ZIP                  0x10003 /* IOMEGA ZIP media */
       #define DK_JAZ                  0x10004 /* IOMEGA JAZ media */

     If the media exists and the host can obtain a  current  pro-
     file  list,  the  command  succeeds and returns the dk_minfo
     structure with data representing that media.

     If there is no media in the drive, the command fails and the
     host  returns  an  ENXIO   error,  indicating that it cannot
     gather the information requested.

     If the profile list is not available, the host  attempts  to
     identify the media-type based on the available information.

     If identification is not possible, the  host  returns  media
     type  DK_UNKNOWN. See NOTES for blocksize usage and capacity
     information.