I recently assisted someone in getting their songs off a SanDisk Clip Sport mp3 player that they purchased while in a federal prison. These players are locked and can't be accessed at all. The only option was to send it to a company along with $35.00 in order to get them to unlock it. Unfortunately not everyone who sends it in gets it or their songs back. So, I offered to help this individual.
First I tried to install new firmware. That didn't work, the computer could see the player but couldn't access it's drive. Then I tried a variety of date recovery software programs. Not a one of them could see or detect anything. I searched the web and came across a comment concerning the iCare Data Recovery Tool. I was skeptical, but I downloaded and installed the program. I ran a search for volume recovery and it saw the drive. I then selected the volume and ran a scan. It found all the songs and all I had to do was select all the folders and files and restore them. I owe it to iCare!
If you want to try out this excellent program, go here: http://www.icare-recovery.com
Good luck!!