Samsung's 840 Evo repair tool available to download, but be careful of the caveats when you update - ExtremeTech
The life span of an SSD – how long does it last and what can be done to take care? | Computer Memory Blog – hints & tips, know-how, wiki, tutorials, troubleshooting,
850 EVO | Consumer SSD | Samsung Semiconductor
Samsung Data Migration to 850 EVO SSD Safely [Secure Boot]