The SC660H external SSD revolutionizes the speed and reliability you’re used to from external storage. It uses new 3D NAND, or stacked TLC Flash and reaches 440MB/s read/write, or four times faster than an external hard drive, to make accessing and sharing content quicker and easier than ever. The drive is just 9.6mm thick, a stylish sandblasted, grooved titanium cover that stands out among other models. The SC660H is available in 256GB and 512GB capacities and compatible with Windows, Mac OS, and Android for simple and efficient data transfers across devices and platforms. The SC660H uses new 3D NAND, or stacked TLC Flash. The technology offers higher density, increased reliability, and better power efficiency compared to previous 2D NAND SSDs. You get a better product at a better value.