Thanks for all of the info in this thread and all the threads before it on the internal memory mod!
I feel like I found a small twist to this mod.
I purchased a cheap $5 USB to SATA converter from amazon and was able to hook up my 2.5" 500GB Western Digital HDD as internal memory with it.
Here is a picture of the USB to SATA converter I used.
Link To Image
I powered both the USB to SATA converter and the 2.5" HDD off this relay circuit:
Link To Image
That can be found from this thread:
http://forums.xbox-scene.com/index.php?showtopic=744513.
This way both the HDD and converter are powered off for the stock side of my system. No chance of live detection! Hopefully this helps someone out somewhere.