In addition, there is two ways I am looking at on how to unlock the drive. The first is like my previous post with drive swapping and brute forcing the password or hexing the password. The problem with this, is that I don't think current "tools" work on the hitachi drive that comes in the headunit, or the extra hitachi drive I have from an old laptop, if I had a western digital, it'd be easy. The other problem with this method is that the headunit may not even lock the secondary drive, it might just throw a code. The secondary method, which I will call the Xbox method, entails the same method used to unlock the original Xbox drives. In this case, you would need to have two separate cables, one for power and one for data. You would also need an adapter to be able to read the drive once unlocked. You would start out with have the data and power plugged into the headunit, once the headunit was one, do some activity on it (on the Xbox it was to rip and play some music) in this case, you could probably get away with just playing music from it if you already have it ripped, if not, rip a song or two. From here, the drive should be unlocked, now you unplug the data only, leaving the power plugged in, and plug the data into the adapter for the PC. Now you should be able to see and read the drive. I will try to get together a parts list needed for doing the Xbox method and update my post
EDIT:
So for the Xbox method, you would need 2x
http://www.ebay.com/itm/2-5-inch-44-Pin-Male-to-Female-IDE-Converter-Cable-/290965686445?pt=LH_DefaultDomain_0&hash=item43bee808ad and then an adapter such as
http://www.amazon.com/gp/product/B002OV1VJW?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00 Basically,you would plug in the one cable to where the harddrive goes into the headunit, then at the other end, cut the connector to where the last 4 pins in a square can be plugged/unplugged separate of the other 40 pins. With the other cable, you should be able to plug in the cable over by a square of 4 pins (the same 4 that you separated from the other cable). I bought the cables and already have the adapter. When they come in, I will do a write up about it.
The one thing about doing it like this compared to trying to get the actual password is having to be connected to the car to unlock the drive. Once the power shuts off to the drive, it will relock.
