sd(7)                      DG/UX 4.30                       sd(7)



     NAME
          sd - AViiON family disk subsystem

     DESCRIPTION
          The sd disk subsystem consists of disk controller/units
          compatible with the Small Computer Systems Interface (SCSI).
          The models supported are as follows:


          Model #   Size

          6539      179 Mbyte half-height non-removable hard disk
                    drive

          6491      322 Mbyte full-height non-removable hard disk
                    drive

          6662      322 Mbyte half-height non-removable hard disk
                    drive

          6554      662 Mbyte full-height non-removable hard disk
                    drive

          6563      Floppy disk drive (5.25 inch) that supports
                    diskettes with these capacities:  1.2 MB, 720 KB,
                    and 360 KB

          6562      Floppy disk drive (3.5 inch) that supports
                    diskettes with these capacities:  1.44 MB and 720
                    KB

          6552      Optical CD-ROM disk drive (5.25 inch) that
                    supports 600 Mbyte CD-ROM discs.

          6627      Magneto-optical disk drive (5.25 inch) that
                    supports removable disks with these capacities:
                    590 MB and 650 MB

          5070DR    Optical WORM disk drive (12 inch) that supports
                    2.4 Gbyte disks.

          5070DS    Optical WORM disk drive (5.25 inch) that supports
                    900 Mbyte disks.

          A physical disk unit may be accessed directly via the
          special file nodes in /dev/pdsk and /dev/rpdsk.  These nodes
          are named in the form:

          /dev/[r]pdsk/sd(adap@c(addr),i,d)

          where:




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     sd(7)                      DG/UX 4.30                       sd(7)



          adap is the name of the SCSI adapter used to access the disk
          (cisc is the name of the external SCSI adapter. insc is the
          name of the internal SCSI adapter),

          c is the hexadecimal device code of the SCSI adapter,

          addr is the control space address of the SCSI adapter,

          i is the SCSI ID number of the disk,

          d is the unit number.

          The nodes in /dev/pdsk provide access as a block special
          device as described in dsk(7).  The nodes in /dev/rpdsk
          provide access as a character special device as described in
          rdsk(7).  When accessing a disk through a /dev/pdsk or
          /dev/rpdsk node, the operating system performs no bad block
          remapping.

          An example of a node for a SCSI disk on an AViiON computer
          follows:

          /dev/rpdsk/sd(cisc@28(fffff200),0,0)

          The /dev/rpdsk/sd pathname specifies a character-special
          SCSI disk; cisc names the SCSI interface for an AViiON
          computer.  The interface is accessed through device code 28.
          The node specifies disk unit 0 at SCSI ID number 0 on the
          SCSI bus.

     FILES
          /dev/pdsk/*
          /dev/rpdsk/*

     SEE ALSO
          dsk(7), rdsk(7).



















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