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Best MicroSD Cards for the Galaxy S8



SanDisk 256GB (Class A1) MicroSD Card

SanDisk 256GB (Class A1) MicroSD Card

Those searching for the absolute BEST performance for their Galaxy S8 will want to buy a microSD card with an "A1 rating". This new technology from SanDisk delivers the fastest performance we've ever seen for storage. It's called the A1 specification. Instead of Class 10, UHS-1, or any of those other crazy markings on an SD chip -- look for "A1". 

Essentially SanDisk's new 256GB A1 microSD card is way faster than anything released over the past few years. And is guaranteed to make our phones open apps and games quicker. Better performance throughout. 

"A1 can manage random read input-output access per second (IOPS) of 1,500 and write IOPS of 500, so it can quickly open apps and process accompanying tasks, such as audio, graphics, saved profiles and in-app permissions."

The biggest difference is with load times on our phones. Launching apps or games is noticeably faster. It sounds like typical "press marketing" but this one is real. All microSD cards in 2017 will be aiming for this type of performance. It's a bit more expensive than most 256GB micro-SD cards, starting around $199. Now a few months later it's often priced under $130. Giving you the most storage physically possible and the best performance at the same time. 

Buy it Now for $129 from Adorama

Or a regular 256GB Ultra Class 10 can be found for $126 which is still plenty fast. 



  1. Walter

    04/10/2017 at 10:53 am

    Hi Cory,

    What is the UHS Bus speed of the Samsung S8? Everything you mentioned was UHS-I, but I’d like to know specifically if it’s I or II. I’ve used 3 different MicroSD cards (all UHS-I) on my S7 and found that only 1 UHS-I was actually able to handle 4K video and not be very slow holding 100+ GB of files/vids/pics. With UHS-II out I’m looking at upgrading for future tech, but will stick with my UHS-I if the Samsung S8 does not support it.

    • Cory Gunther

      08/16/2017 at 11:55 am

      From what I understand the Galaxy S8 supports UHS-II

  2. Amanda

    04/14/2017 at 12:26 pm

  3. dave

    05/10/2017 at 10:02 am

    were can i buy memory card to make my s8 up to 265 gb

  4. Michael Brown

    08/17/2017 at 4:18 am

    Thank you so much for sharing this great blog.Very inspiring and helpful too.Hope you continue to share more of your ideas.

  5. Orion Hopper

    09/02/2017 at 1:06 am

    A1 sd card means the card handles an input-output access per second of 1500 and write files at a third of that speed. We can store apps, files, photos, videos, and documents. It can quickly open apps and process accompanying tasks. Last year I brought a San Disk memory card from an online store like “Mobansp” have the huge collection on this but I think this one is helpful for us.

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