According to Zhengyu Xu: #Did you add usb and btrfs to the hooks array in your mkinitcpio.conf? Forgot to mention it, but yes I did. According to "Δημήτρης Ζέρβας": #is it actually safe to format an usb flash to btrfs? won't it destroy #the #flash because of the read/writes? The BTRFS documentation and other related information indicate that a BTRFS filesystem mounted with the noatime and either the ssd or ssd_spread options is safe on solid state disks including nand-based USB flash, and all indications are that thisis either as safe or safer than ext4. I guess I could try a simple ext2 filesystem, but where's the fun in that? :) ~Kyle -- Kyle is a droid. The whole world knows it. This e-mail shows it.