Freeware app for recovering data from faulty external HDD

Hi all

A client's home laptop HDD failed. I popped it into a USB 3.0 sata caddy and the drive can be seen in My Computer on a working PC. I can browse the Users and see My Docs, My Pictues, Music, Desktop etc. I've tried copying the directories from the faulty HDD to my own PC but it hangs everytime. 

Is there an application out there that can scan what data can be retrieved from the faulty disk then dump it on the C drive of a working computer or even another external HDD.

As usual its holiday snaps etc that havn't been backed up that the user wants.

Thanks.