After researching on it, I found out that the Sony Memory Card File Rescue software can be downloaded from Sony’s website.
He asked me if I knew anything about it but I never heard about it. Although there are other free software to recover deleted photos, a Sony made software might have better compatibility with Sony memory cards. The weird thing is it doesn’t come with a disc that can allow the user to install Sony’s memory card file rescue software. At the back of the memory stick PRO-HG Duo plastic cover, it said that the purchaser can use Sony’s own file rescue software that enables users to recover accidentally deleted files. My uncle recently bought a Sony NEX-5 camera and he was advice to get a Sony memory stick PRO-HG Duo because of the high speed data transfer.