SanDisk Ultra Alexa Enabled MicroSDXC, 400 GB

Last updated: August 31, 2022


This microSD card boasts a huge amount of storage for such a compact form-factor. The read and write speeds are rated as "Class 10" which means you'll not be waiting long to save or load content with this card.

SanDisk Ultra Alexa Enabled MicroSDXC, 400 GB

We looked at the top MicroSD Cards and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best MicroSD Card you should buy.

Product Details

Key Takeaway: This microSD card will hold a serious amount of data and it works at fast speeds.

In our analysis of 31 expert reviews, the SanDisk Ultra Alexa Enabled MicroSDXC, 400 GB placed 3rd when we looked at the top 9 products in the category. For the full ranking, see below.

From The Manufacturer

The SanDisk Ultra microSD UHS-I card gives you the freedom to shoot, save and share more than ever before. It is perfect for recording and watching Full HD video,(2) with room for even more hours of video. Transfer speeds of up to 100MB/s** help you move all your content blazingly fast—up to 1000 photos in just one minute.(6) Ideal for Android-based smartphones and tablets, this card’s A1 rating means that you can load apps faster too.(1) And, with capacities up to 512GB* capacity, this card lets you capture and store more than ever before. | * 1GB=1,000,000,000 bytes. Actual user storage less. | ** [for 64GB-512GB] Up to 100MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. [for 16GB-32GB] Up to 98MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. | (1) 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. | (2) Full HD (1920×1080) video support may vary based upon host device, file attributes, and other factors. See official SanDisk website. | (3) Card only. See official SanDisk website. | (5) Download and installation required. See official SanDisk website. | (6) Based on 4.1GB transfer of photos (avg. file 3.5MB) with USB 3.0 reader. Results may vary based on host device, file attributes and other factors.

Our Expert Consultant

Molly Thornberg   
Technology and parenting blogger

Molly Thornberg is a professional writer, creative and mom to four kids, living her best life outside of Dallas, Texas. With a love for all things tech, she is passionate about helping parents raise kids in the digital age. She writes about technology, parenting and humor on her blog Digital Mom Blog.

Expert Reviews


What reviewers liked

The card can store up to 40 hours of full HD video.
This Class 10 card provides a huge amount of extra storage for your Switch, but is also compatible with Android smartphones and tablets as well as many other devices thanks to the included adapter.
This card performs flawless... not only in my Galaxy Note 4 phone but also in my camera. Leave it formatted in the default exFat and your good!
We like that this MicroSD Memory card is speed rated “UHS-1” / “Class 10”, which means you get Full HD (1920×1080) video recording and playback. We also like that SanDisk has a “Memory Zone App” for easy file management it helps to organize data on Android-based devices and effortlessly back it up to the card. They also have “RescuePRO” back-up / recovery software which simplifies recovery of files that were accidentally deleted.

What reviewers didn't like

The SanDisk Ultra microSDXC UHS-I memory card costs $249.99 which is not cheap.
You may also need to update your system to work with this XC, or Extended Capacity, SD card.
The Sandisk Ultra 400GB memory card is certainly not a cheap product.
View our MicroSD Card buying guide for in-depth advice and recommendations.

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