Samsung. Pro Endurance 64GB microSD. Check Price. 10. Sandisk. Ultra 32GB microSDHC. Check Price. (Image credit: Samsung Memory on Unsplash) If you're looking for the best microSD card for your phone, action camera, drone, dashcam or other device, we'll help you find it. The SanDisk Ultra is classified as having an U1 speed, as indicated by the U inside a 1. This indicates that a transfer speed of up to 10MB/S can be supported by the card. Contrast that to the SanDisk Extreme, which is 3 times faster at transferring data than the SanDisk Ultra and has a speed class of U3. The Sandisk Ultra is a memory card that works at up to 120 MB/s for the read speed, and for the writing speed, it works at 90 MB/s. The Sandisk Extreme, on the other hand, works at 150 MB/s (megabytes per second) for the reading part, and the writing one is at 70 MB/s. 96VvjS.

sandisk ultra vs extreme microsd