1.\" $OpenBSD: rd.4,v 1.7 2019/04/16 13:58:45 sunil Exp $ 2.\" 3.\" This file is in the public domain. 4.\" 5.Dd $Mdocdate: April 16 2019 $ 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.Cm rdsetroot 20tool. 21.Sh FILES 22.Bl -tag -width /dev/rrd??XXX -compact 23.It Pa "/dev/rd??" 24Block mode ramdisk devices. 25.It Pa "/dev/rrd??" 26Raw mode ramdisk devices. 27.El 28.Sh SEE ALSO 29.Xr elf 5 , 30.Xr rdsetroot 8 31