Looks like you are trying to connect it as USB device. Windows won't mount Mac formatted partitions. Additional drivers are needed.
Try to use shared folders engine (I believe you used it before with PD7).
PS: Did I understand correctly that you are using Windows as guest as you trying to find your disk in "My computer".
Meanwhile this part of forum called "Mac OS X Guest OS Discussion". I missed that.
Last edited: Dec 10, 2013