dparam man page on Xenix

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     DPARAM(ADM)	      XENIX System V		   DPARAM(ADM)

     Name
	  dparam - Displays/changes hard disk characteristics.

     Syntax
	  dparam [ -w ]
	  dparam /dev/rhd[0|1]0 [characteristics]

     Description
	  The dparam command displays or changes the hard disk
	  characteristics currently in effect.	These changes go into
	  effect immediately and are also written to the master boot
	  block for subsequent boots.  If a non-standard hard disk is
	  used, this utility must be called before accessing the
	  drive.

	  The -w option causes a copy of /etc/masterboot to be copied
	  to disk to ensure that non-standard hard disks are supported
	  for the specified drive.  This call must precede a call to
	  write non-standard disk parameters for the desired
	  parameters to be saved correctly in the masterboot block.

	  When called without options or disk characteristics, dparam
	  prints the current disk characteristics (on the standard
	  output) for the specified hard disk.	These values are
	  printed in the same order as the argument list.

	  When writing characteristics for the specified hard disk,
	  dparam changes the current disk controller status and
	  updates the masterboot block.	 The argument ordering is
	  critical and must be entered as specified below.  All
	  characteristics must be entered when writing disk
	  characteristics, otherwise an error is returned.  Hard disk
	  characteristics (in respective order) are:

	  number of cylinders		   total number of
					   cylinders on the hard
					   disk
	  number of heads		   number of heads
	  reduced write current cylinder   hardware specific,
					   consult your hardware
					   manual
	  write precompensation cylinder   hardware specific,
					   consult your hardware
					   manual
	  ecc				   number of bits of
					   error correction on
					   I/O transfers, consult
					   your hardware manual

     Page 1					      (printed 2/7/91)

     DPARAM(ADM)	      XENIX System V		   DPARAM(ADM)

	  control			   very hardware
					   specific, consult your
					   hardware manual
	  landing zone cylinder		   where to park heads
					   after shutting down
					   the system
	  number of sectors per track	   number of sectors per
					   track on the hard disk

     Examples
	  dparam -w

	  dparam /dev/rhd10

	  dparam /dev/rhd00 700 4 256 180 5 0 640 17

     Notes
	  This utility changes the kernel's view of the hard disk
	  parameters. It may be subject to restrictions imposed by the
	  hardware configuration.

     Page 2					      (printed 2/7/91)

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