SanDisk Extreme Smartphone MicroSDXC, 128 GB

Last updated: October 13, 2023


This microSD card offers a fast and reliable memory card in one of the most common sizes seen today. You'll be able to use it on a wide variety of devices.

SanDisk Extreme Smartphone MicroSDXC, 128 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 is well suited for most smartphones as a reliable memory storage device.

In our analysis of 31 expert reviews, the SanDisk Extreme Smartphone MicroSDXC, 128 GB placed 4th when we looked at the top 9 products in the category. For the full ranking, see below.

From The Manufacturer

With the SanDisk Extreme 128GB(1) microSD UHS-I Memory Card get extreme speeds for fast transfer, app performance, and 4K UHD video.(2) Ideal for your Android smartphone, action cameras or drones, this high-performance microSD card handles 4K UHD video recording, Full HD video and high-resolution photos. The super-fast SanDisk Extreme microSDXC memory card reads up to 160MB/s* and writes up to 90MB/s.* Plus, it’s A2-rated, so you can get fast application performance for an exceptional smartphone experience.(7) | Not all devices support microSD memory card formats. Check with your device manufacturer for more details. | * For 128GB-400GB: Up to 160MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, requires compatible devices capable of reaching such speeds. Up to 90MB/s write speeds. 1MB=1,000,000 bytes. | (1) 1GB=1,000,000,000 bytes. Actual user storage less. | (2) Compatible device required. Full HD (1920×1080) and 4K UHD (3840 x 2160) support may vary based upon host device, file attributes and other factors. | (3) Download and installation required. | (4) Card only. See SanDisk website for additional information and limitations. | (5) UHS Speed Class 3 (U3) designates a performance option designed to support real-time video recording with UHS-enabled host devices. Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS-enabled host devices. | (6) Registration required; terms and conditions apply. | (7) For 64GB-400GB: A2 performance is 4000 read IOPS, 2000 write IOPS. Results may vary based on host device, app type and other factors. | (8) Read only; based on internal testing. Results may vary based on host device, file attributions 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

With this new model, it has slightly improved speeds.
This is rated for faster A2 application performance (4000 read and 2000 write IOPS) and lists 160MB/s sequential reads with 90MB/s write speeds.
The A2 performance means the card will maintain at least 4,000 random read and 2,000 randrom write operations per second, making it ideal for use in smartphones, tablets and mobile devices for expanded storage.

What reviewers didn't like

If you want the best performance on a device that uses full size SD cards, you're better off buying a full size SD card instead of microSD cards that come with an SD adapter.
The new Extreme 160MB/s UHS-I microSD card offers up to 160MB/s read speed when used in SanDisk's own reader. When used in other UHS-I card readers or even older SanDisk readers its performance is lower.
View our MicroSD Card buying guide for in-depth advice and recommendations.

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