SanDisk - Here's a breakdown of what the various symbols on a memory card refer to: 1. Maximum speed the card reads (transfers) files 2. Maximum speed the card writes (captures)
Amazon.com: SanDisk 128GB Ultra SDXC UHS-I Memory Card - Up to 140MB/s, C10, U1, Full HD, SD Card - SDSDUNB-128G-GN6IN : Electronics
Advertising vs reality: microSD memory card speed test: Digital Photography Review