HDD version not available yet. Hopefully coming soon.
The kicker is used when you boot from a floppy and the floppy contains DOS drivers which find your USB stick and then loads the program on the USB stick and runs it, thus booting NASLite. This allows you to "boot" from USB even though your BIOS doesn't support it. Really you are booting from floppy which then "kicks" over to the USB drive.
Search the forum for links to the kicker disk files and how to test booting from USB with a kicker diskette.
For example, this one:
http://www.serverelements.com/phpBB2/viewtopic.php?t=988&sid=a5f3f78df032dccbcea5fe47f84fed9e