Product Description Times are changing and now external durable storage is moving to SSD. Say hello to USB 3.1 Gen 1 and high-grade 3D TLC NAND Flash with speed-enhancing algorithms and a DRAM cache, delivering performance multiple times higher than mechanical hard drives. The SD700 reaches 440MB/s read and write, compared to max 100MB/s on an HDD. That means even the biggest files, like 4K movies, transfer much faster. Even better, the SD700 is wrapped in a protective shell that enables it to go with you everywhere, long term