Review / Test: Lexar Micro SDXC 64gigas – Class 10 – UHS-1


Lexar is a big brand quite well known (perhaps a little less present in Europe, but it remains known) that builds among other digital media such as SD cards, USB sticks, but also card readers, etc.

Today, it will be the test of one of their 64 gigas (so SDXC) class 10 micro-SD card.

64 gigas, that’s I would say, the greatest capacity you can get with microSD cards in everyday life. There are greater capabilities, but this one is rare to find. (Not to mention the fact that at the latest news, I don’t know of a smartphone that can hold SD cards of more than 64gigas)

By the way, know that a new barrier has been crossed recently: 512 gigas on a microSD card! By a brand (totally?) unknown to the general public: Microdia. The last record was 200 gigas on a microSD, owned by Sandisk (which is still a much better known brand!).

64 gigas, it’s not very telling I think because the hard drives of 64 gigas, it’s very old, but 512gigas … there are still 512 gigas! When I compare a 512giga mechanical hard drive with a microSD card, there is only one thing that comes to mind: Ben could !!!

Going back to Lexar’s microSDXC card (which can be turned into an SD card thanks to the adapter provided), this one is Class 10.

Some useful info:

  • (micro) SD: maximum 2 gigas
  • (micro) SDHC: 4 to 32 gigas
  • (micro) SDXC: more than 32 gigas

Beware of compatibility!

  • Class 2: min 2mo/s writing speed
  • Class 4: min 4mo/s
  • Class 6: min 6mo/s
  • Class 10: min 10 mops

Be careful that these are minimum speeds, and therefore Class 2 cards may very well have a better speed than a Class 10

  • UHS-1: other speed technology

More info: microSD map on Wikipedia // SD map on Wikipedia


Features of Lexar microSDXC 64gigas – Class 10 – UHC-1

  • Compatible with a wide range of devices
  • Quick transfer
  • Capture videos in full HD and 4K
  • SD adapter for great compatibility
  • Can store all your media content

The test

First of all, the microSD adapter to SD is provided, it’s already a good thing, because this allows a much greater compatibility of devices! You don’t just need to insert it only in devices that accept only microSDs like smartphones, but you can also insert it into SD-friendly devices such as digital cameras, digital camcorders, etc.!

In reading/writing speed test, here’s what it looks like:

  • A Samsung-branded microSD card, 32 gigas capacity, Class 10
    • reading speed: 18 MB/s (announced at a maximum of 24 MB/s by the manufacturer)
    • Writing speed: 11 MB/s (announced at a maximum of 13 MB/s by the manufacturer)
  • The Lexar brand microSD card, 64 gigas capacity, class 10
    • reading speed: 36 MB/s (announced at a maximum of 45 MB/s by the manufacturer)
    • writing speed 19 MB/s (no data except the fact that it is less than 45 MB/s)

As we notice, Class 10 is well respected and you could even say that Class 20 (which does not exist) is practically affected.

With a famous leap forward regarding the speed of reading much higher than some competitors!

We also notice that compared to the other microSD card, there is practically a factor 2, either in terms of speed or in terms of capacity. This is just a coincidence, just because there is a factor in storage capacity does not mean that there is a factor in terms of speed.

Note: the speed values are not fixed, they vary from one moment to the next and also depend on the device used.


The Lexar is a very good card (micro)SD of very high capacity with excellent speed of writing and reading!

To see over time (some microSD cards have their memory deteriorated with a certain number of writing/reading), but concretely, it is worth the detour for compatible devices, you will in principle have no problem recording and reading, whether for HD or 4K!


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