Ebay scam #2,000,000,001: Upgrade your Xbox 360 Hard Drive to 200GB+
"...instructions on how to disassemble and install a new hard drive physically."
This means the instructions tell you how to disassemble the hard drive enclosure. Sure, you could put a bigger HDD in there, but it won't work. The drive would have to have the same files, file setup, and there is probably proprietary firmware on the factory drives. These instructions say nothing about formatting a replacement drive, or copying files. If it was easy to just pop a bigger drive in there, we would have heard about it by now. I'm guessing using Ghost to image an original doesn't work either.
These instructions also tell you how to utilize an external USB hard drive for added storage. To be clear, you can only access music and pictures from an external USB hard drive. Here's how to do that:
Llama's USB HDD instructions
I've seen bids on similar "items" for $80+. What a rip off. It's pretty obvious how to disassemble the factory HDD enclosure, so this "item" provides no useful information.
Just a warning to fellow 360 owners. I'm only out $0.99 in order to appease my curiosity. Now, no one else should have to.