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I bought my 850 Pro back in November of 2014. I also installed Samsung Magician software. The drive has been running extremely well. Magician notified me of a firmware update a few days ago and I went ahead with the update. This morning I received the dreaded I/O boot error. After 2 hours of troubleshooting connected devices and cables, etc., I zeroed in on the drive. Dead. I called Samsung, and before I told tech the reason for my call, he started talking about processing an rma. He knew. Apparently the latest firmware update has nuked 850 Pro drives when the update is installed through Samsung Magician software. I am going to replace the drive and leave the firmware alone. In fact, I have found there really is no need to install the Samsung Magician software at all. ==== 02/25/2105: Just a follow up note to state the obvious. If you own the 850 Pro and have Samsung Magician software installed and decided to update to the most recent firmware version through the software, then you need to back up and image the drive ASAP in case of failure. My drive ran fine for a few days after the update, then came sudden death. I don't have the firmware rev. that caused this but it is the last one issued. Samsung C.S. (800) 726-7864.