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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 elfrdsetroot tool.
The elfrdsetroot tool is available as part of the distribution toolset.

/dev/rd??
Block mode ramdisk devices.
/dev/rrd??
Raw mode ramdisk devices.

elf(5)
October 18, 2013 OpenBSD-5.7