Samsung Electronics has begun mass producing a more affordable SSD, seeking to help drive the technology deeper into the corporate data center. The PM853T will start shipping before the end of June and is based on Samsung's 3-bit MLC (multi-level cell) technology, the company said Monday. That stores three bits per memory cell, which increases storage density compared to SLC (single-level cell) or 2-bit MLC drives, and helps lower the cost per bit.