Bests & Worsts Reviews from Amazon

I've bought 14 of these drives over the last eight months. As of today, FIVE of the fourteen have failed. But when I say failed, they haven't lost the data on them; they are simply locked and won't mount. A phone call to Sandisk and I'm told that this is a "safety feature" so my data won't be lost. How is it a "safety feature" when I can't access my data? The only solution Sandisk has offered is to replace the drive and I can send the "failed" drive to a third party and pay $50 to have the data recovered. That's NOT a solution! After paying close attention to when and how this happens, it appears to be caused by moving large blocks of files from one of the Sandisk drives to another location. At some point during the copy, an error message pops up that the USB drive can no longer be read and it will vanish from my desktop. No amount of moving it or trying to mount it using the computer's disk utilities or trying to read it in another USB port will help. It's locked and nothing will unlock it! Do NOT buy these if you're planning to move files around. I believe they heat up too much, which then triggers this "safety feature" and causes you to be unable to access your data. I'm extremely unhappy with this "safety feature" and with Sandisk's response to the issue. Will NEVER buy anything Sandisk ever again!