NEWFS_SYSVBFS(8) System Manager's Manual NEWFS_SYSVBFS(8)

newfs_sysvbfs
construct a new System V Boot File System

newfs_sysvbfs [-FZ] [-s sectors] special

newfs_sysvbfs builds a System V boot file system on the specified special. If it is a device, the size information will be taken from the disk label and before running newfs_sysvbfs the disk must be labeled using disklabel(8); the proper fstype is “SysVBFS”. Otherwise, the size must be specified on the command line.

The following arguments are supported:

Create file system to a regular file.
sectors
Create file system with specified number of disk sectors.
Fill file with zeroes instead of creating a sparse file.

disklabel(5), disktab(5), disklabel(8), diskpart(8)

A newfs_sysvbfs command first appeared in NetBSD 4.0.

UCHIYAMA Yasushi <uch@NetBSD.org>.

The sysvbfs support is still experimental and there are few sanity checks.
September 12, 2016 NetBSD 9.4