About this item Save time with card offload speeds of up to 180MB/s powered by SanDisk QuickFlow Technology (Up to 180MB/s read speed. Engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. SanDisk QuickFlow Technology is only available for 64GB, 128GB, 256GB, and 512GB capacities. 1GB=1,000,000,000 bytes. Actual user storage less.) Pair with the SanDisk Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately) Write speeds up to 130MB/s (Engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes.) Perfect for shooting 4K UHD video and sequential burst mode photography (Full HD (1920x1080) and 4K UHD (3840 x 2160) video support may vary based upon host device, file attributes and other factors. See HD page on SanDisk site.) Capture uninterrupted video with UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) (UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices. See the SD Association’s official website.) 256GB Extreme SDXC UHS-I Memory Card - C10, U3, V30, 4K, UHD, SD Card - SDSDXVV-256G-GNCIN Electronics › Computers & Accessories › Computer Accessories & Peripherals › Memory Cards › SD Cards Electronics › Computers & Accessories › Computer Accessories & Peripherals › Memory Cards › SD Cards Electronics › Computers & Accessories › Computer Accessories & Peripherals › Memory Cards › SD Cards Electronics › Computers & Accessories › Computer Accessories & Peripherals › Memory Cards › SD Cards