Sandisk ultra plus microsd uhs-i cards are ideal companions for high-performance android smartphones and tablets. that means you can take more photos and videos without worrying about running out of space.. The sandisk ultra plus is a mainstream ssd designed for client system use. the ultra plus uses a standard 2.5" 7mm form factor with sata 6gb/s interface and is powered by a marvell 9175 controller with in-house sandisk firmware and sandisk's 19nm mlc nand. the combined package nets sequential read and write performance of up to 530 mb/s and 445 mb/s respectively.. Strontium nitro plus nano 64gb; synthetic benchmarks - atto and crystal diskmark. sandisk claims read and write speeds of more than 100 mbps and around 50 mbps respectively, and these are backed.