Sandisk Ultra 256gb MicroSDXC Review

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Updated June 27, 2022
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85 Expert Rating

Sandisk Ultra 256gb MicroSDXC uhs-i has an enormous memory capacity. It’s ideal for upgrading your mobile phone’s memory or recording full HD video. It can even be used to expand the storage on gaming devices like the Nintendo Switch. This memory card is durable and is resistant to temperature, water, shock, and x-rays. These are just some of the reasons why it made our best micro SD card list. For another space option, you might want to take a look at our Maxwell AirStash review.

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Why We Like It – Sandisk Ultra 256gb microSDXC

With a storage capacity of 256 GB, this Sandisk Ultra MicroSD card is able to fulfill a number of roles including upgrading mobile phone memory, recording videos, or backing up your files. It also comes at a reasonable price which should be affordable for most people.

  • Decent storage capacity at 256 GB
  • Crazy long battery life
  • High read speed of up to 100MB/s
  • Write speed not the fastest at 10MB/s
  • It might exceed the maximum capacity of certain devices
  • Some devices may encounter errors reading this card


This SD card sits in the middle of the lineup below the Sandisk Extreme and Extreme Pro ranges. However, it’s still a top performer with a gigantic 256 GB capacity. The Sandisk Ultra boasts maximum read speeds of up to 100MB/s, with write speeds hitting 10MB/s. The minimum sequential write speed sits at 30MB/s. The read and write speeds are also quick enough for full HD or even 4K recording. The Sandisk Ultra 256 GB is one of the best memory cards with more space than many other microsd cards like the Micro Center 64GB.

Related: Check out our Samsung Evo Plus review.


The design is similar to most sd cards out there but doesn’t feel flimsy like some of the rivals. In fact, it’s shockproof, waterproof, temperature proof, and X-ray proof. Because of its rugged design, it comes with a 10-year limited manufacturer warranty. If you need a tougher card, the Samsung 128 GB MicroSDXC is a fantastic alternative. The MicroSDXC card comes with the ubiquitous adapter for use in a variety of devices ranging from laptops to cameras. It can also be used with the Sandisk Memory Zone app to backup files and sync your memory with cloud storage.


Considering the Sandisk Ultra’s mammoth capacity, it represents great value for money. It has nearly everything you can ask for in an SD card. While the read and write speeds are not the fastest, they should be adequate for most everyday tasks. It’s still classified as Class 10, which is the highest speed class rating possible. This 256 GB memory card sits in the sweet spot between price and performance. For a more affordable alternative, you can try the Silicon Power 64 GB 3D NAND.

Sandisk Ultra 256gb microSDXC Wrap Up

The Sandisk Ultra 256 GB comes with large memory capacity and great read and write speeds. It’s versatile enough to be used for recording HD video, playing games, and storing files. Unfortunately large capacity can be a disadvantage because some devices won’t be able to read it. Otherwise, it’s a durable memory card that comes at a fair price.

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