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RD(4) Device Drivers Manual RD(4)

rd
ramdisk driver

pseudo-device rd [
count
]

The rd 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 rdsetroot (a.out(5)) or elfrdsetroot (elf(5)) tool.

/dev/rd??
block mode ramdisk devices.
/dev/rrd??
raw mode ramdisk devices.

The rdsetroot and elfrdsetroot tools are available as part of the distribution toolset.
May 31, 2007 OpenBSD-5.4