| VND(4) | Device Drivers Manual | VND(4) | 
vnd —
pseudo-device vnd
options VND_COMPRESSION
vnd driver provides a disk-like interface to a file.
  This is useful for a variety of applications, including swap files and
  building miniroot or floppy disk images.
This document assumes that you're familiar with how to generate kernels and how to properly configure disks and pseudo-devices in a kernel configuration file.
In order to compile in support for the
    vnd, you must add a line similar to the following to
    your kernel configuration file:
pseudo-device vnd # vnode disk driver
To also compile in support for reading compressed disk images, add the following option to your kernel config file:
options VND_COMPRESSION # compressed vnd(4)
Compressed disk images are expected in the cloop2 format. They can be created from “normal” disk images by the vndcompress(1) program.
There is a run-time utility that is used for configuring both
    compressed and uncompressed vnds; see
    vnconfig(8) for more
    information.
vnd driver does not work if the file does not reside
  in a local filesystem.
| September 29, 2017 | NetBSD 10.0 |