Hello, I've been reading through some of the threads and a lot of people are encountering this problem. My phone is indeed in Mass Storage Mode, and under Disk Management I don't see the phone drive neither. I hope someone can help me with this. My phone is a Samsung S4, thanks in advance!
I have a S4 and there is no mass storage mode so I'm not sure how you managed to go into such mode.
If disc manager doesn't see it there's not much any recovery program can do.