dvhtool --device devicename [ option ]

dvhtool -d devicename [ option ]


dvhtool is a utility for displaying SGI disk partition and volume header information as well as for copying files to and from the volume header.

It is similar to the IRIX(tm) utility of the same name, however the options and usage are quite different. Also, the IRIX utility cannot display partition and boot file information.

The disk volume header includes the disk partition table and the volume directory. The volume directory is an index to the files stored in the volume header part of the disk. These files can be anything but are usually standalone programs (like sash, the SGI standalone shell). The space available for files is usually limited to one, two or a few megabytes, this can only be changed by repartitioning the disk with fx, the SGI disk formatting and partitioning tool or fdisk.

You must be root to invoke dvhtool. The device name can be /dev/sda for the first disk, /dev/sdb for the second, and so on.

dvhtool will also work on a file image of a disk volume header.

OPTIONS -d, --device devicename Specify the volume header device name (or file image)


Show volume header data only


Show volume table of contents


Show partition data


Equivalent to all three above options

--vh-remove name

Remove volhdr file name.

--vh-to-unix name file

Copy volhdr file name to Unix file file

--unix-to-vh file name

Copy Unix file file to volhdr as name


Show usage information

RELATED TO dvhtool…


IRIX tools: fx(1M), prtvtoc(1M), vh(7M).


dvhtool was written by Ralf Baechle <[email protected]>, Keith M. Wesolowski <[email protected]>, Tor Arntsen <[email protected]>, Guido Guenther <[email protected]>.