Being the unhappy owner of a 2Gb memory stick which just stopped working, ie. no physical damage, just refusal to power on or mount onto a selection of machines, I was facing the loss of several critical files (one of which in particular contained 4 years worth of notes and details of an ongoing project). I contacted one (nameless) data recovery company who examined the device and stated that there was no physical damage (which was obvious), but the flash memory was damaged beyond repair, and no data could be retrieved. As a final resort I sent the stick to R3 Data Recovery on a Friday afternoon. By 6 pm on the Saturday, an engineer emailed me a list of the files he was able to retrieve, including the critical one, and following settlement of the (in my opinion, reasonable) invoice, a new data stick was promptly returned to me with all my missing files. Many thanks to R3 Data Recovery !