NanoBSD は64MBの CF にインストールできる．

With configuration settings, it is possible to configure options passed to both the
buildworld and installworld stages of
the NanoBSD build process, as well as internal options passed
to the main build process of NanoBSD. Through these options it
is possible to cut the system down, so it will fit on as little as 64MB. You can use the
configuration options to trim down FreeBSD even more, until it will consists of just the
kernel and two or three files in the userland.