Bryan is right (of coarse), I have unplugged my HM hundreds of times and never had it corrupt the file system. I have corrupted the file system when the SD card ended up not fully seated in the slot, in that case I just simply removed the SD card and re-imaged it (from my PC) and I was back up and running without a hitch. So I wouldnt worry about it, it's not quite like a PC, needing to be properly shut down and all....