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.\" $OpenBSD: rd.4,v 1.2 2004/03/21 19:47:59 miod Exp $
.\"
.\" This file is in the public domain.
.\"
.Dd May 14, 2001
.Dt RD 4
.Os
.Sh NAME
.Nm rd
.Nd ramdisk driver
.Sh SYNOPSIS
.Cd "pseudo-device rd" Op Ar count
.Sh DESCRIPTION
The
.Nm
driver enables use of system or user memory as a disk.
Memory for the disk must be allocated and initialized inside the
kernel image at build-time using the
.Nm rdsetroot
tool.
.Sh FILES
.Bl -tag -width /dev/rrdXX -compact
.It Pa "/dev/rd??"
block mode ramdisk devices.
.It Pa "/dev/rrd??"
raw mode ramdisk devices.
.El
.Sh SEE ALSO
The
.Nm rdsetroot
tool is available as part of the distribution toolset.
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