display hard disk characteristics
/bin/dparam [ -w ] [ disk_node ]
The dparam command supports writing the masterboot block
of a hard disk and displaying disk parameters.
Previous versions of dparam supported changing hard disk
characteristics; this is no longer supported.
The system detects and sets hard disk configuration parameters automatically.
All hard disk parameters in use reflect the values used
by the system BIOS.
The dkinit command, which provided a menu-driven front
end to dparam in previous releases, is also no longer supported.
The default disk_node accessed by dparam
is the raw device for the entire primary hard disk
dparam supports one option:
Copies /etc/masterboot to the disk's masterboot block
to ensure that non-standard hard disks are supported for the specified drive.
The following hard disk characteristics are printed by dparam,
in this order:
The parameters are specific to the type of hard disk;
consult the hardware specification manual or the
manufacturer for the correct information.
number of cylinders
number of heads
cylinder number at which to start reducing the current when writing
cylinder number at which to start precompensation when writing
number of bits of error correction on I/O transfers
controller type number
cylinder number used to park the heads on shutting down the system (landing zone)
number of sectors per track
Run dparam on the root hard disk and copy
/etc/masterboot to it:
Run dparam on the secondary hard disk:
Never run dparam on a disk partition or division.
If specified, disk_node must be a raw device that
refers to a whole disk.
The masterboot file is usually copied to drive
Drive 1's masterboot is only used to determine virtual drive
partitioning, not for masterboot code to boot up or for disk
Disk parameters for both drives are kept on disk 0.
dparam copies /etc/masterboot to sector 3
(1-based) on some devices
(such as Enhanced Memory Adapters). This is to prevent it
overwriting the POSTEXT masterboot sector that
configures the card at boot time.
raw interface to entire primary hard disk
raw interface to entire secondary hard disk
masterboot block code
information about the hard disks configured on the system
dparam is not part of any current standard specification.
© 2005 The SCO Group, Inc. All rights reserved.
SCO OpenServer Release 6.0.0 -- 03 June 2005