We provide many forms of installation media, but neither floppy nor iso images are "best" suited for usb drives. It's pretty easy to make a hard drive image containing the installer bsd.rd.
I tested this on i386, it should work on amd64 too. It's just a bunch of shell commands, save it to makeimage.sh or whatever. Maybe we could integrate this into the distrib build makefiles, but I wanted to get a procedure done first. I don't know what the best way to get a disklabel on is, I just dumped a tiny bit of text into a file. It's actually very similar to what builds the install.iso, but I didn't do it as a makefile for now so it's easier for standalone users to run. It assumes you have a working bsd.rd in /. If you wanted to build amd64 on i386, or vice versa, you'll have to fiddle with the files. #!/bin/sh set -e cp /bsd.rd . gzip -9 bsd.rd dd if=/dev/zero bs=1k count=3584 of=disk.img sudo vnconfig vnd0 disk.img sudo fdisk -y -i vnd0 echo "16 partitions:" > disklabel.txt echo "# size offset fstype [fsize bsize cpg]" >> disklabel.txt echo " a: 6944 128 4.2BSD 2048 16384 1" >> disklabel.txt echo " c: 7168 0 unused" >> disklabel.txt disklabel -R vnd0 disklabel.txt newfs -i 512000 vnd0a mount /dev/vnd0a /mnt cp bsd.rd.gz /mnt/bsd cp /usr/mdec/boot /mnt/boot /usr/mdec/installboot /mnt/boot /usr/mdec/biosboot vnd0 umount /mnt vnconfig -u vnd0 rm bsd.rd.gz rm disklabel.txt