1. add the word "usb_storage" to the end of the file "/etc/modules"
2. save the file and reboot
3. usb storage devices are loaded at boot time
saravanan@saravanan-desktop:~$ sudo cat /etc/modules
[sudo] password for saravanan:
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
lp
rtc
usb_storage
saravanan@saravanan-desktop:~$
