SanDisk MicroSD Ultra 128GB+ Dual Drive 64GB
- Storage Size: 128 GB
- Transfer Rate: 653 x
That new A1 category means the card handles an input-output access per second (IOPS) of 1,500 and write files at a third of that speed. SanDisk explains that the enhanced speed allows apps to open quickly, even using programs that filled with high-resolution graphics and audio files.