How to install FreeBSD without CD-ROM, Floppy nor PXE?
Today I have experienced how to install FreeBSD from a USB device - quite simple so you can do it yourself :-)
First, initialize the USB solid state disk with bsdlabel(8):
bsdlabel -wB /dev/da0
Then, initialize a file system:
newfs -O1 /dev/da0a
Third, copy CDROM’s /boot to it.
And you can now boot from the USB disk.
Similiary, you will be able to build your own tiny system this way.