Recuva works very well however be prepared to wait a while for it to do it's business. I think it even has a default option to scan removable media now which saves you applying filters manually.
(For future reference - these 'bricks' tend not to work very well on iPad as the OS isn't really designed with copying onto the device in mind. Android is less of a problem as it's a standard USB interface and a version of Linux - you can even plug keyboards in if you wanted!)