As a designer myself and while I do most of my designs using my computer, I faced this problem of my hard drive on my PC getting crashed when I was in the middle of a most important design. I restarted my PC and then to my whole shock my design was lost because I hadn't saved any of the work onto my hard disk myself and all that was saved was by the application itself.
I then approached my friend who is a technical expert and is quite good at systems. He saw over the situation and recommended me a hard drive recovery software that would recover files from the system very easily. He said he would do all the stuff for me and I was not quite OK with the recovery stuff thinking how can anything be recovered when it wasn't saved by me!.
He then a recovery software that can be found here. The software did all the good work and voila, all my work in progress designs were recovered and I was able to continue my design just where I left it! I also came to know that even the knowledgeable and professionals use and call upon salvagedata software to salvage or recover their seemingly unrecoverable data more than any other.
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