Save time with SanDisk QuickFlow Technology-powered card offload speeds of up to 190 MB/s. Its proprietary technology allows for read speeds of up to 190 MB/s, surpassing UHS-I 104 MB/s, but it requires compatible devices that can achieve such speeds. Performance may be lower depending on the host device interface, usage circumstances, and other factors, according to internal testing. One million bytes, or 1MB. Only the 64GB, 128GB, 256GB, 400GB, 512GB, and 1TB capacities support SanDisk QuickFlow Technology. 1TB is equal to 1,000,000,000,000 bytes, and 1GB is equal to 1,000,000,000 bytes. Less actual user storage To get the fastest speeds, pair with the SanDisk Professional PRO-READER SD and microSD (separately sold). For quick shooting, write speeds of up to 130 MB/s Performance may be lower depending on the host device interface, usage circumstances, and other factors, according to internal testing. One million bytes, or 1MB.)