I don't know if this is the correct place but I supposed that it was interesting cause it has been always thought the opposite.
here the POV:
It's a 160 GB HDD but only recognises 149, and has its own bat.
This is not a mod, is a fully comercial unit.
Hope you find it interesting
With the last firm it's also compatible with the Hostcore
Firmupdate: SPS 1119