Lexar microSDXC UHS-I card

A quick way to move files between various devices

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Lexar Media microSDXC UHS-I card
  • Expert Rating

    4.75 / 5


  • Fast Class 10 performance
  • Small form factor
  • Large 64GB capacity


  • MicroSDXC card gets hot
  • Bit expensive

Bottom Line

The microSDXC UHS-I card is excellent for those of you who move a lot of data. It makes transfers more convenient, and the speed of the microSDXC card and USB 3.0 adds to its overall efficiency. Its only real downside is the price.

Would you buy this?

[Read the review of Lexar's latest 200GB, Class 10 633x MicroSD card here]

The Lexar High Performance microSDXC UHS-I card is a class 10, 64GB card bundled with a tiny USB 3.0 stick. It’s a simple product, but that's where its value lies. You can use this microSD card to rapidly transfer files between smartphones, PCs, notebooks, and tablets. The only real catch is the $110 asking price.

What’s it good for?

The microSDXC card and tiny USB 3.0 adapter provide a few benefits over other means of transferring data to and from your smartphone or tablet. Most importantly, they provide a fast connection. If you plug the USB adapter into a USB 3.0 port on your computer, you'll be able to transfer large files in a short amount of time, and in many cases much quicker than you could by connecting your device directly to your computer using a cable.

That's the other advantage of this device: there is no need to have USB transfer cables dangling around your device. For example, if you want to put a bunch of movies on your phone or tablet from your PC, you plug the microSDXC card into the USB 3.0 adapter and transfer the files to the microSD card, then place the microSDXC card into your mobile device to access the content. The only real annoyance could be having to take off your phone's cover to re-insert the microSDXC card after every transfer.

There are other products for transferring data to and from a mobile device, such as Verbatim Store ‘n’ Go OTG USB drive, the Imation 2-in-1 Micro USB flash drive, or the SanDisk Ultra Dual USB drive. With those devices, you have to transfer your data to the USB stick from the computer, and then transfer it again from the USB stick to the smartphone or tablet (or stream it off the stick, which will leave it protruding from the mobile device). We think the microSDXC UHS-I card is a much more efficient way to transfer files between different types of hardware because it only requires data to be transferred once.

Another good thing about this microSDXC card is that if you have a full-sized SD card adapter, you can also use it in your digital camera, so it's not just for phones and tablets. The USB 3.0 stick is compatible with other microSD cards, so you can buy those separately if you require more than one. The USB 3.0 stick itself acts as the gateway for the card, so the transfer speed is largely up to the type of microSD card that you use. The one that Lexar bundles in this kit is fast.

[Related: Kingston 256GB MicroSD XC card review]


We tested the microSDXC card and USB 3.0 stick with a Sony VAIO Pro 13 Ultrabook, and received impressive results. Our first test involved the transfer of 4.09GB worth of AVI and MP4 files. It took 98sec to move this data from the Ultrabook to the microSDXC card, and occurred at an average write speed of 45.3 megabytes per second (MBps). Sending the files back from the microSDXC card to the VAIO Pro 13 took 47.71 seconds, putting the average read speed at 88.6MBps.

In our second test, we moved a much smaller set of data, 444MB worth of MP3 files, during which we found the microSDXC card was slower. We copied the MP3 content to the microSDXC card in 6.8sec, which translates to an average write speed of 13.08MBps. Going the other way, it took 13sec, for a read speed of 73.5MBps.

In the CrystalDiskMark test, the microSDXC card recorded sequential read and write speeds of 91.42MBps and 46.52MBps, respectively, which are close to the results we saw in our large-file tests.

The microSDXC card in the USB 3.0 adapter. The card can get quite hot while transferring data, so wait a few seconds before removing it.
The microSDXC card in the USB 3.0 adapter. The card can get quite hot while transferring data, so wait a few seconds before removing it.

We must note that when transferring files for more than one minute, the microSDXC card (when inserted in the USB 3.0 adapter) generated some serious heat, to the point that it could almost burn the skin. We recommend letting it cool for 15 to 30sec after you've finished your transfers before removing the microSDXC card from the USB. Despite the heat, the microSDXC continued to function properly, although time will tell whether the heat has an impact on its durability over more than our one month using the product.

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