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on November 10, 2017
I love it! Works great in my Galaxy Note 8! Fast enough that I can throw pretty much anything at it. If you're wondering, modern Android versions (starting with Lollipop, as I recall) have the ability to read up to 1 TB of external storage. While this 400GB card is the maximum capacity you can currently buy*, the leading manufacturers are feverishly working to make larger capacity cards. For now, though, I think 400GB is enough to handle all the 4K video I can shoot.

*- Don't be fooled by unscrupulous sellers, particularly on auction sites ( I won't name it because there are a lot of fake cards here, too), who list ridiculously large capacity cards for astonishingly low prices... you don't get what you pay for! They take cheap, generic cards, usually no more than 4 or 8 GB, and rewrite the card's firmware & re-label it to make it act and appear like a larger card... 256GB, 500GB or higher! There are tons of listings out there for 1 TERABYTE microSD cards! Of course there's no such thing: and when the physical memory of the card is reached, your device will simply start overwriting data... and your precious photos, videos and other files will be gone forever. In fact, one third of all SanDisk cards on the market are counterfeit! You can avoid all this by installing and using a free app called SD Insight to determine if your card is legitimate.
440 people found this helpful
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I got this 128 GIG card to use with my tablets. So far it has worked perfectly in my testing. I always keep a couple of spares around for my future buys and I seem to give a lot of my SD cards away to family and friends. I picked up this 128 GIG at a great price and I just couldn’t pass it up.

I own about 100 SD cards and I always do a speed test to verify the reading and writing speeds before I install the memory. This card checked out extremely well. The fastest write speed on this card was 73.143 MB/Sec and the fastest reading speed was 93.368 MB/Sec. I have attached the graphical test data for your information. I used a USB 3.0 port with a USB 3.0 card reader for the test.

Overall, this card worked well and I rated it five stars. If I have any future issues I will update my review.

I hope my review and photo of the test data helps you.

Out of 100 plus SD cards I have purchased from Sandisk I have only had one fail. With Sandisk’s 10 year warranty they replaced it and sent me a new one at no charge. That is the advantage when you purchase high tech from a top company that stands behind their product.

I simply called them and returned the old chip and they sent me a new one.

I am amazed at how well these work and how low the price has gotten on a sale day. Putting one of these into your phone or tablet is a wonderful upgrade to the device’s storage capability.

Almost no one needs a 128 GIG chip but at sales prices you can’t pass up getting them.

This is a great product and it makes your smart devices even more powerful.

This is a simple and easy upgrade for your smart devices.
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143 people found this helpful
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on May 4, 2018
Just received a fake sdcard. I knew something was wrong when I opened the package and place the micro sdcard in the sdcard adapter. Then I looked closer at the micro sdcard and notice that the name print was misaligned. If you notice the real one is made in China and the fake is made in Taiwan BEWARE! WASTE OF TIME!
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73 people found this helpful
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on May 5, 2018
It died after 5 minutes of use. It looks like a fake, the font doesn't match, and the color is a bit off. Feel free to comment. The most disturbing thing is that I purchased it for Amazon direct!
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84 people found this helpful
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on March 28, 2018
I always use SanDisk and think they are top-notch. However, beware of fakes! I got an obvious fake microSD card, and the retail package had obviously been opened before I received it.
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65 people found this helpful
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on November 25, 2017
Sandisk Ultra 200GB Micro SDXC UHS-I Card with Adapter - 100MB/s U1 A1 - SDSQUAR-200G-GN6MA
The card was tested with H2testw and as you can see, the long-term averaging resulted in 31.9MB/s write and 87.6MB/s read speed. Fast enough for use in phones and tablets and your Nintendo Switch.
Card tested successfully at full capacity. The card was received in full retail packaging and seems to be genuine. Item was received promptly and packaged appropriately.
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43 people found this helpful
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on August 28, 2017
This is a great card. Using it to actually run a disk intensive application as a portable test bed environment. Far, far faster than I expected to be, doing something that it wasn't necessarily designed for. I had tried other Speed Class 10 cards that were marginal, but this one met the need.
102 people found this helpful
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on October 4, 2017
This is about the 5th one I've had to order, they last about a year with video use on a dashcam, on a Raspberry Pi, they last around 3 months. These are NOT designed for heavy read/write activity, and don't seem to have any built in wear leveling.

However, Compared to other brands, these last forever, the no-names don't go a month in a raspberry pi with heavy usage.
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on April 13, 2018
Bought two. Both averaged 14MB/s and would burst to about 20MB/s. Nowhere near the 98MB/S claimed. Tried to return same day received (after working with them for 90 minutes, and amazon wouldn't stating "This item note qualified for return."
17 people found this helpful
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on June 1, 2018
I bought it to use as extended memory in the little tablet computer i use on the road. Works great. Inserting the small card is a bit like surgery on the computer. But that is not the fault of the card, but has more to do with the design of the computer. So It will stay there. I wont swap it back and forth between different devices. I am considering another one for my phone.
14 people found this helpful
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