It'll work on any Xbox, you cut and connect two pairs of the yellow cable together, making the Xbox think the DVD-drive is still connected.
Then you'd need a molex splitter connected to the original power supply for another HDD or whatever you want to connect...
I tried expanding the old HDD with another HDD (fourth for me) by assigning a new drive letter to it, but I didn't succeed.
It would've been great if one could just have it formatted and addressed as drive D... (tried both Linux disc and altering some other install discs and apps too without success, it just won't recognise. If it'd worked, I could have had 1 HDD as a shared D-drive, serving for my other seperate 3)
I'll see if I can find the pics I took for this mod.
EDIT:
here's the pic I followed for removal of the DVD-drive:

(Don't forget to connect the 3 V wire onto the Mobo.)
Then I followed the tut here for the DPDT switch:
http://www.llamma.com/xbox/Mods/extra_harddrive.htm
You'll also need to make some sort of mount for the second HDD with some plastic hotglued to the original DVD-drive cradle.
Make sure you got the holes and screws to fix the HDD tight onto it.
Then rrmove to front cover from the DVD-drive and align it with the Xbox cover, attempting to fill the hole left by the DVD-drive.
(I glued mine in and blackened it with a marker.)
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