SanDisk 400gb Ultra Microsdxc Uhs-I Memory Card

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. 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.

Was a real sandisk ultra 64g type 10 and meets the speed ratings. It came preformatted with exfat and is correct 64g chip, not a fake. Please note that amazon is throwing all the reviews for all the chips into one place. So if you want accurate reviews, be sure you are looking only at reviews for you particular chip. This review is only for the sandisk ultra 64g microsd with sd adapter. I ran a free drive and memory test program on it. It passed 5 complete passes of testing every memory byte in several different test patterns without any failures. This verified capacity and accuracy of read writes over a few hours time. I then ran attos disk benchmark tool and it’s results show that it does reach very near 100mb/s read speeds and 40mb/s write speeds. No laptop i have or other device is as fast as my computer’s usb 3.

The capacity shown on fake cards can be modified to show a size greater than what it actually is. A fake 256gb card having only 32gb instead. Some unknowing person could use the card without knowing it was fake and find that the data was corrupted when it got past 32gb or encounter a very very slow transfer rate past a certain point. To check if the card you bought is legit or not use fakeflashtest (fast) and h2testw (slower but thorough). This will delete the content on your card so backup whatever you have before using it. The speed and pictures i got from my legit 256gb card are attached. The product code is edited out for product support issues.

Top card doesn’t work / bottom card works. Bought the top card june 18 2018 for a nintendo switch and the games would download to 99% and then suddenly i’d get an error. When these cards went on sale recently i bought a new one just to see if it was the card. I could not believe how different the fonts were. Also the color of the bad card is off (slightly more purple and less red). Sure enough, i was able to download games to the new card without incident. The real product works great but i just can’t justify giving 5 stars when i had this experience.

Purchased for my nintendo switch, works perfectly. I originally thought it didn’t work because i kept getting an error on my console when i copied my old sd to the new one using my macbook, but apparently the issue was introduced because i used a macbook due to how their files are stored on their sd format. I switched over to windows, copy/pasted my data from the old to the new and everything just worked like nothing ever happened. Also, i learned that the sandisk ultra is actually faster than the sandisk extreme for nintendo switch. This is because the switch explicitly supports the sdxc-uhs-i. So if you’re looking to benefit from the speeds on the uhs-iii, you’re going to actually lose performance by a 10th of a millisecond. Tl;dr: if you’re looking for a sd card for the switch, no matter the capacity, this is the highest performing chip available to you.

Our highest-capacity microSD card is perfect for recording and watching Full HD video, (2) with room for even more hours of video. (7) Transfer speeds of up to 100MB/s ensure that you can move all your content blazingly fast—up to 1200 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 its unprecedented 400GB capacity, this card lets you capture and store more than ever before. | 1GB=1,000,000,000 bytes. Actual user storage less. | 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. | (1) 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. | (3) Card only | (5) Download and installation required | (6) Based on 4.1GB transfer of photos (Average file 3.5MB) with USB 3.0 reader. Results may vary based on host device, file attributes and other factors. | (7) Approximations; results and Full HD (1920×1080) video support may vary based on host device, file attributes and other factors.

From the manufacturer

Previous page

Next page

SanDisk Ultra

Need more speed?


Android phone/tablet	Devices	Phone, ActCam, Drone

Full HD	Video Quality	Full HD, 4K UHD

—	Music Capacity	48 albums

—	Photos and Video	480 photos/200 mins⁶

Up to 100MB/s²	Read Speed	Up to 160MB/s²

—	Write Speed	Up to 60MB/s²

C10, U1, A1	Class	C10, U3, V30, A2


Android phone/tablet	Devices	Phone, ActCam, Drone

Full HD	Video Quality	Full HD, 4K UHD

—	Music Capacity	96 albums

—	Photos and Video	960 photos/400 mins⁶

Up to 100MB/s²	Read Speed	Up to 160MB/s²

—	Write Speed	Up to 90MB/s²

C10, U1, A1	Class	C10, U3, V30, A2

Previous page

SanDisk Extreme 64GB
SanDisk Extreme 128GB

Next page

Learn More

Features and Spesification

Make sure this fits
by entering your model number.
Ideal for Android smartphones and tablets, and MIL cameras
Capacities up to 512GB (1GB=1,000,000,000 bytes. Actual user storage less.) to store even more hours of Full HD video (Approximations; results and Full HD (1920×1080) video support may vary based on host device, file attributes and other factors.)
Up to 100MB/s transfer read speed (Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.) lets you move up to 1000 photos in a minute (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.)
Load apps faster with A1-rated performance (A1 performances is 1500 read IOPS, 500 write IOPS. Based on internal testing. Results may vary based on host device, app type and other factors.)
Class 10 for Full HD video recording and playback (Full HD (1920×1080) video support may vary based upon host device, file attributes, and other factors.)
SanDisk Memory Zone app for easy file management (Download and Installation Required)
10-year limited manufacturer warranty
Order with your Alexa enabled device. Just ask “Alexa, order SanDisk microSD.”

Product Info

Product description

Capacity:400GB