A1 performance is 1500 read IOPS, 500 write IOPS. Based on internal testing. Results may vary based on host device, app type, and other factors. SanDisk Ultra® microSDHC™ and microSDXC™ UHS-I cards are compatible with Android™ smartphones and tablets, Chromebooks, and Windows® laptops. Just insert the card to instantly increase available storage space—at a great value relative to alternatives. New Windows® convertible and ultra-light laptop users, in particular, who were accustomed to the multiple terabytes of storage common on larger laptops will appreciate cards enabling more private physical storage. Approximations: Results and Full HD (1920x1080) video support may vary based on host device, file attributes, and other factors. Rated A1 3, the SanDisk Ultra® microSD™ card is optimized for apps usage. It delivers faster app launch and overall app usage performance that in turn provides a better smartphone experience. Blazing transfer speeds lets you offload cards fast. Use with the SanDisk® MobileMate® USB 3.0 microSD™ card reader 6 to achieve up to 150MB/s speeds 2.

Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors. See: www.sandisk.com/HD.

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See Western Digital White Paper- Flash 101 and Flash Management. A detailed overview of flash and flash management (August 2018): https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/collateral/white-paper/white-paper-sandisk-flash101-management.pdf Up to 150MB/s read speed, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speed. Write speeds lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions, and other factors. 1MB=1,000,000 bytes.