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format.dat(4)                    File Formats                    format.dat(4)

       format.dat - disk drive configuration for the format command

       format.dat  enables  you  to  use  your  specific disk drives with for-
       mat(1M).  On Solaris 2.3 and compatible systems, format will  automati-
       cally configure and label SCSI drives, so that they need not be defined
       in format.dat. Three things can be defined in the data file:

         o  search paths

         o  disk types

         o  partition tables.

       The following syntax rules apply to the data file:

         o  The pound # sign is the comment character.  Any  text  on  a  line
            after a pound sign is not interpreted by format.

         o  Each definition in the format.dat file appears on a single logical
            line. If the definition is more than one line long,  all  but  the
            last line of the definition must end with a backslash (\).

         o  A  definition  consists  of  a  series of assignments that have an
            identifier on the left side and one or more values  on  the  right
            side.  The  assignment operator is the equal sign (=). Assignments
            within a definition must be separated by a colon (:).

         o  White space is ignored by format(1M).  If  you  want  an  assigned
            value  to  contain white space, enclose the entire value in double
            quotes ("). This will cause the white space within  quotes  to  be
            preserved as part of the assignment value.

         o  Some  assignments can have multiple values on the right hand side.
            Separate values by a comma (,).

       The data file contains disk definitions that are read in by  format(1M)
       when  it  starts  up.  Each definition starts with one of the following
       keywords: search_path, disk_type, and partition.

       search_path     4.x: Tells format which disks it should search for when
                       it  starts  up.  The list in the default data file con-
                       tains all the disks in the GENERIC configuration  file.
                       If  your  system  has disks that are not in the GENERIC
                       configuration file, add them to the search_path defini-
                       tion in your data file.  The data file can contain only
                       one search_path definition.  However, this single defi-
                       nition  lets you specify all the disks you have in your

                       5.x: By default, format(1M) understands all the logical
                       devices  that are of the form /dev/rdsk/cntndnsn; hence
                       search_path is not normally defined on a 5.x system.

       disk_type       Defines the controller and disk model.  Each  disk_type
                       definition contains information concerning the physical
                       geometry of the disk. The default  data  file  contains
                       definitions  for  the  controllers  and  disks that the
                       Solaris operating environment supports. You need to add
                       a  new  disk_type only if you have an unsupported disk.
                       You can add as many disk_type definitions to  the  data
                       file as you want.

                       The  following  controller  types are supported by for-

                       XY450           Xylogics 450 controller (SMD)

                       XD7053          Xylogics 7053 controller (SMD)

                       SCSI            True SCSI (CCS or SCSI-2)

                       ISP-80          IPI panther controller

                       The keyword itself is assigned the  name  of  the  disk
                       type. This name appears in the disk's label and is used
                       to identify the disk type whenever format(1M)  is  run.
                       Enclose the name in double quotes to preserve any white
                       space in the name.

                       Below are  lists  of  identifiers  for  supported  con-
                       trollers.  Note  that  an  asterisk ('*') indicates the
                       identifier is mandatory for that controller  --  it  is
                       not part of the keyword name.

                       The  following  identifiers  are assigned values in all
                       disk_type definitions:

                       acyl*                   alternate cylinders

                       asect                   alternate sectors per track

                       atrks                   alternate tracks

                       fmt_time                formatting time per cylinder

                       ncyl*                   number of logical cylinders

                       nhead*                  number of logical heads

                       nsect*                  number of logical  sectors  per

                       pcyl*                   number of physical cylinders

                       phead                   number of physical heads

                       psect                   number  of physical sectors per

                       rpm*                    drive RPM

                       These identifiers are for SCSI and MD-21 Controllers

                       read_retries    page 1 byte 3 (read retries)

                       write_retries   page 1 byte 8 (write retries)

                       cyl_skew        page 3 bytes 18-19 (cylinder skew)

                       trk_skew        page 3 bytes 16-17 (track skew)

                       trks_zone       page 3 bytes 2-3 (tracks per zone)

                       cache           page 38 byte 2 (cache parameter)

                       prefetch        page 38 byte 3 (prefetch parameter)

                       max_prefetch    page 38 byte 4 (minimum prefetch)

                       min_prefetch    page 38 byte 6 (maximum prefetch)

                       Note: The Page 38 values are device-specific. Refer the
                       user to the particular disk's manual for these values.

                       For  SCSI  disks, the following geometry specifiers may
                       cause a mode select on the byte(s) indicated:

                       asect           page 3 bytes 4-5 (alternate sectors per

                       atrks           page 3 bytes 8-9 (alt. tracks per logi-
                                       cal unit)

                       phead           page 4 byte 5 (number of heads)

                       psect           page 3 bytes 10-11 (sectors per track)

                       And these identifiers are for SMD Controllers Only

                       bps*            bytes per sector (SMD)

                       bpt*            bytes per track (SMD)

                       Note: under SunOS 5.x, bpt is  only  required  for  SMD
                       disks.  Under  SunOS 4.x, bpt was required for all disk
                       types, even though it was only used for SMD disks.

                       And this identifier is for XY450 SMD Controllers Only

                       drive_type*     drive type (SMD) (just call this "xy450
                                       drive type")

       partition       Defines a partition table for a specific disk type. The
                       partition table contains the partitioning  information,
                       plus  a  name  that lets you refer to it in format(1M).
                       The default data file contains default partition  defi-
                       nitions  for several kinds of disk drives. Add a parti-
                       tion definition if you repartitioned any of  the  disks
                       on  your  system.  Add as many partition definitions to
                       the data file as you need.

                       Partition naming conventions differ in SunOS 4.x and in
                       SunOS 5.x.

                       4.x:  the  partitions are named as a, b, c, d, e, f, g,

                       5.x: the partitions are referred to by numbers 0, 1, 2,
                       3, 4, 5, 6, 7.

       Example 1: A sample disk_type and partition.

       Following  is a sample disk_type and partition definition in format.dat
       file for SUN0535 disk device.

       disk_type = "SUN0535" \
            : ctlr = SCSI : fmt_time = 4 \
            : ncyl = 1866 : acyl = 2 : pcyl = 2500 : nhead = 7 : nsect = 80 \
            : rpm = 5400
       partition = "SUN0535" \
            : disk = "SUN0535" : ctlr = SCSI \
               : 0 = 0, 64400 : 1 = 115, 103600 : 2 = 0, 1044960 : 6 = 300, 876960

       /etc/format.dat                 default data file if format -x  is  not
                                       specified,  nor  is  there a format.dat
                                       file in the current directory.


       System Administration Guide: Basic Administration

SunOS 5.10                        19 Apr 2001                    format.dat(4)