Samsung have just released a firmware fix to address the EVO 840 SSD data access issue. The drives were plagued with a problem causing older data to be read incredibly slowly, much to the annoyance of many users.
We recommend that any users wishing to perform the firmware fix back up their data (twice) beforehand. If drives are configured in a RAID formation they will need to separated before performing the update.
Samsung state that the update can take up to an hour depending on the amount of data on the drive.
Grab the firmware here.
The program is compatible with a wide range of Samsung SSD models including 830, 840, 470 Series, 840 EVO, 840 PRO, 850 PRO, 850 EVO. The application is a well-thought suite giving you a hand in improving the performance of your SSD drives. 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 $127.89 Samsung Electronics 840 EVO-Series 120GB 2.5-Inch SATA III Single Unit Version Internal Solid State Drive MZ-7TE120BW.