"The Vertex 3 is equipped with the latest controller from Sandforce, the SF2281TB1-SDC-ES. Sandforce's 2281 controller is a second generation product that uses enhanced Duraclass technology to deliver optimized power consumption, security, wear leveling, and drive performance in a single chip solution. The Vertex 3 has a total of sixteen 16GB 25nm MLC NAND modules on board, eight on each side of the PCB. The NAND is made from Intel, although you may see Micron on board. If you do the math, the total NAND equals 256GB, or 16GB more than the capacity of the drive. This extra space is used by the controller to keep the drive optimized and replace cells that may have failed."
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