Not a problem opening the case. I got one real cheap and opened the case.
1. remove the two rubber bottom stickers at the rear
2. remove the screws
3. from the front; move the top casing to the left (bottom casing to the right)
4. it should come off now.
5. now you can access the drive
I removed this drive and placed it in my asus laptop. (had to tweak the bezel)
BTW the drive is a sony DW-U50A