Transcend's ultra-compact SATA III 6Gb/s M.2 SSD 420S addresses the high-performance needs and strict size limitations of small form factor devices, best fitted to Ultrabooks and thin, light notebooks. Boasting high-quality flash chips and enhanced firmware algorithms, Transcend's M.2 SSD 420S delivers optimal reliability.Unlike the prevailing planar NAND chips, 3D NAND flash may be a sort of non-volatile storage during which the memory cells are stacked vertically in multiple layers. 3D NAND is developed to interrupt through density limitations of the 2D planar NAND, and thus can deliver a greater level of performance and endurance.Compliant with M.2 form factors Type 2242 and 2280, Transcend's 3D NAND M.2 SSDs are perfect to be used in Ultrabooks and light-weight notebooks. Measured at just 42mm long , the M.2 SSD 420S makes for a simple upgrade to your computer, taking over little space while giving it a way needed energy boost.Featuring the M.2 standard (42mm), subsequent generation SATA III 6Gb/s interface and a strong controller, Transcend's M.2 SSD 420S reaches incredible read and write speeds of up to 500MB/s and 430MB/s. When used as a cache, the M.2 SSD 420S provides 1.5 times faster boot time than conventional hard drives.Dedicated to maximizing high-performance computing, the M.2 SSD 420S features 4k random file read and write accelerates to 75,000 IOPS that deliver incredibly short loading times and almost instant response for heavy graphics and multimedia applications.Despite its extra-small dimensions, the M.2 SSD 420S contains advanced features to reinforce the performance of the SSD. Engineered with a RAID engine and featuring built-in SLC caching technology, it utilizes LDPC coding to correct errors and ensure data integrity.