Customer Review

Reviewed in the United States 🇺🇸 on April 26, 2019
When I first reviewed this card I assumed I had received a fake or defective card, because the performance it delivered was SLOWER than my older SanDisk A1 rated micro SD cards. However, that doesn't seem to be the case...

Further research in collaboration with others seems to have unlocked a dirty little secret about these new A2 rated cards. They are actually SLOWER than A1 cards unless you have an A2 certified device, and there are almost none of those available at this time.

SanDisk won't openly admit this when contacted about the less than stellar performance, but they keep pushing you to buy their specific Mobilemate USB 3.0 card reader, which may be the only (or at least one of the very few) A2 certified devices available at the time of this review.

Now to be clear I wasn't expecting the maximum advertised performance. Even though my A1 rated SanDisk cards all met or exceeded their advertised specs, I was pretty sure that A2 cards would require newer hardware to achieve their lofty numbers, but I was expecting them to exceed the performance of the much less expensive A1 cards. They do not! While they are faster than your typical Class-10 card, they are slower than A1 rated cards, and that's something you won't find in any documentation.

The only test that was faster on this A2 card was sequential write, and since I was comparing an "Extreme" to an "Ultra" card, that was to be expected. In every other performance category the A1 card was faster. Multiple tests were run on multiple devices, and while the numbers varied between devices, the results were consistent. Sequential read and both read and write IOPS were 10-15% faster on the A1 card, and IOPS is the main reason you'd even want an A2 card!

If you are upgrading from a regular Class-10 card this will be much faster, but so will a less expensive A1 card, and you probably won't notice the difference, so why spend more?

If your intended device isn't "A2" certified, buyer beware.
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