Samsung Electronics Co., the world's largest manufacturer of computer memory chips and smartphones, on Monday unveiled a smaller version of its new high-performance, high-density data storage devices, further expanding its line-up of so-called solid state drives (SSD) and offering a wider range of choices to consumers. A SSD is a data storage device mainly used for laptops. The 840 EVO mini SSD, one-fourth the size of its existing model, boasts the industry's largest storage capacity and smallest size. The new product offers up to 1TB capacity, weighs 8.5 grams and is 3.85 millimeters thick, according to Samsung.