Sandisk™ Top Speed ​​Mobile SSD delivers high-performance transfers with read speeds of up to 520MB/s**, allowing you to move files quickly. Capacity is up to 2TB with up to 2TB of high-speed storage, the maximum speed of Sandisk™ Mobile Solid State Drive is ideal for storing photos, videos, and high-resolution audio files for a variety of creative activities. The design of delicate and small shape, only pocket size. Good things are not great! Although smaller than a smartphone, Sandisk's maximum speed™ mobile solid state drive offers superior performance and capacity. How to verify the Capacity and Speed of the memory card? 1). Please use quality USB 3.0 card reader to verify all memory card by H2testw on PC. Real memory card should pass H2testw with no error. 2). Please don't use cheap card reader to test Micro SD card, speed of Micro SD card will be reduced by low quality card reader. 3). Micro SD memory card speed is greatly affected by card reader and the capacity you choose , USB port ect. Low quality device will 100% slow down card speed,1MB=1000KB. Product Details: Parameters Capacity: 480GB, 1TB, 2TB Performance/Speed: Read speed up to 520MB/s Product size: 9.91mm x 46.9mm x 96.9mm (HxWxL) Product weight: 78.9g Operating temperature: 0 to 45 degrees Storage temperature: -20 degrees to 70 degrees Compatible with: Windows 10, Windows 8.1, Windows 7, Mac OS High Sierra, Mac OS X EI Capitan Read speed up to 520MB/s