I used in common HD slot an SSD and in this secondary box an 750Gb HD… really useful!
In Century Computer City after an afternoon of searching, only one shop have this box but online it’s more easy find this.
Go with your pc model number because not all cd/dvd slot are the same! for example my laptop is Acer and i bought a Thinkpad box… for a little difference I had to adapt box…
How to prepare:
– under your laptop usually have 1 screw for put out your cd/dvd
– insert secondary HD in the new box (simple fit in)
– insert the new box in cd/dvd side
– put the screw
– finished!
Otherwise I can help you, I love repair pc… 😉