This card optimizes performance with quick read speeds up to 190MB/s.(1) Pair with the Sony Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately).[128GB-1TB]
128GB: Up to 190MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, requires compatible devices capable of reaching such speeds. Up to 90MB/s write speeds. Based on internal testing; performance may be lower depending upon host device interface, usage conditions and other factors. 1MB=1,000,000 bytes.