dw(4) — UTek W2.3



DW(4)                   COMMAND REFERENCE                   DW(4)



NAME
     dw - Winchester disk driver for 6130 System workstations

DESCRIPTION
     The dw device provides access to the integral Winchester
     disk drive.  Device naming conventions specify a two letter
     description of the device, followed by the slot number,
     followed by the drive number, followed by any partition
     information.  The slot number and drive number for integral
     devices are 0.  The disk is normally divided into 16 disk
     partitions.  The desired partition is indicated by minor
     device number 0 through 15.  The partitions are named 'a'
     through 'p'.  A partition on the standard Winchester disk is
     therefore accessed as dw00[a-p]

     In block mode, the system accesses the disk via the normal
     file buffering mechanism and allows reading and writing
     without regard to physical disk records. A raw interface
     exists which provides one I/O operation per read or write
     call.  The names of the raw files are prefixed with 'r'.

     The following disk drives are supported: Micropolis 1302,
     Micropolis 1304, and Maxtor XT-1105.  The Micropolis 1302
     has 830 cylinders with 512 bytes/sector, 16 sectors/track
     and 3 tracks/cylinder. The Micropolis 1304 has 830 cylinders
     with 512 bytes/sector, 16 sectors/track and 6
     tracks/cylinder.  The Maxtor XT-1105 has 918 cylinders with
     512 bytes/sector, 16 sectors/track and 11 tracks/cylinder.

     I/O requests must begin on a sector boundary and must not go
     beyond the end of the disk.  The dw00 a partition is
     normally used for the root file system; and the dw00 b
     partition as a paging area.  Partitions c through h are
     considered data partitions and are currently not defined.
     Partitions i through k are reserved for further use by UTek.
     Partition l covers partitions a through h for easier
     referencing; partition m is used by the UTek diagnostics; n
     is used as the defect partition (it contains the
     manufacture's defect data).  o is the maintainence
     partition; and p references the entire disk.  When accessing
     partitions a through k, a bad sector replacement scheme is
     used to present a "perfect" disk.  For partitions l through
     p, no such scheme is used.

FILES
     /dev/dw00[a-p]           block files

     /dev/rdw00[a-p]          raw files

DIAGNOSTICS
     The following errors may be returned.




Printed 10/17/86                                                1



DW(4)                   COMMAND REFERENCE                   DW(4)



     [EBUSY]
         Drive not ready (on a read or write).

     [ENXIO]
         Nonexistent drive (on open); or (on a read or write)
         offset is too large or not on a sector boundary.

     [EIO]
         A physical error other than ``not ready''.














































Printed 10/17/86                                                2

%%index%%
na:72,92;
de:164,2416;
fi:2580,158;
di:2738,122;3004,301;
%%index%%000000000091

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