There does seem to be a faulty USB drive or USB port, but this shouldn't interfere with normal system operation unless a system partition (i.e. /var/) is mounted on it.
Your hard reset was probably the cause though, files may have been lost.
One advice found through google:
http://unix.derkeiler.com/Mailing-Li.../msg00322.html
So make sure /var/db/entropy/ exists, clean out the contents.