That's the sound of your, my, and all of our hard drives dying, forever.
Hard drives are officially on the way out. Sony has just announced their Type G laptop, which has a 32GB flash drive, and two weeks ago, Samsung pulled the covers off their new 64GB flash drive. The death rattle for hard drives (which sounds like a clicking hard drive anyway) sounds.
Flash drives (also called SSD or Solid State Drives) have no moving parts and if you drop them...well actually, if you drop them I think they still break. But they are faster and lighter than platter-style hard drives, so you should embrace them with the unquestioning loyalty demanded by technology's inexorable march. Sure, they're prohibitively expensive, but so is everything in the beginning. You'll get over it.