From CDOT Wiki
# '''SATA Hard disk in removable drive tray''' (at least 160GB). Please buy the tray from ACS or the bookstore as not all trays are compatible.
# '''USB flash drive''' (64GB or larger recommended).
#'''Text''' - Linux Administration - A Beginner's Guide,
6th Edition by Wale Soyinka, ISBN 978-0-07- 154599- 4, Published by Mc Graw Hill