1.\" $OpenBSD: rd.4,v 1.4 2007/05/31 19:19:51 jmc Exp $ 2.\" 3.\" This file is in the public domain. 4.\" 5.Dd $Mdocdate: May 31 2007 $ 6.Dt RD 4 7.Os 8.Sh NAME 9.Nm rd 10.Nd ramdisk driver 11.Sh SYNOPSIS 12.Cd "pseudo-device rd" Op Ar count 13.Sh DESCRIPTION 14The 15.Nm 16driver enables use of system or user memory as a disk. 17Memory for the disk must be allocated and initialized inside the 18kernel image at build-time using the 19.Nm rdsetroot ( Xr a.out 5 ) 20or 21.Nm elfrdsetroot ( Xr elf 5 ) 22tool. 23.Sh FILES 24.Bl -tag -width /dev/rrdXX -compact 25.It Pa "/dev/rd??" 26block mode ramdisk devices. 27.It Pa "/dev/rrd??" 28raw mode ramdisk devices. 29.El 30.Sh SEE ALSO 31The 32.Nm rdsetroot 33and 34.Nm elfrdsetroot 35tools are available as part of the distribution toolset. 36