I use livecd-iso-to-disk to make up an Fedora-15-x86_64 USB Hard Disk Live, but failed... I got message "can't access tty: job control turned off" and stoped. Then I check dmesg, the last message was: [ 26.184299] dracut Warning: No root device "live:/dev/disk/by-uuid/7dbba1bb-1c88-4e2c-9ebe-ac5c22293623" found Afterwards, I found disk only /dev/sda、/dev/sda1-6 exist, but its my local disk, nothing else with my USB Hard Disk.

Whole dmesg output and extlinux.conf are in the annex.