Samsung's 840 Evo repair tool available to download, but be careful of the caveats when you update - ExtremeTech
Samsung 840 Pro 512GB SSD Review - Performance, Value, Battery Life and Untouchable IOPS | The SSD Review
Amazon.com: New A+ Samsung SSD HDD 840 PRO 2.5" 7mm 128GB MZ-7PD128BW MZ7PD128HCFV-1BW00 0Z000 SATA 3.0 6.0Gb/s MLC Hard Disk Solid State Drive Laptop : Electronics
Samsung 840 Evo review: Finally, an SSD that has almost everything - CNET