Amazon.com: Customer reviews: SanDisk 400GB Ultra microSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card

Top positive review

Believe the "Fake Card" Hype - Photo to Prove It

Reviewed in the United States on September 30, 2018

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! Check out photo. 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. Buyer beware!

3,141 people found this helpful

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Barbara A Botts

Defective card

Reviewed in the United States on August 13, 2018

After trying and trying repeatedly to use this microcard as a replacement in my Samsung S7 - hours of frustration, seeking guidance from internet, friends, etc. I gave up, thinking it was just my ineptitude. Tried again several times, it would never work.
Finally, decided to try a different/new card. Sure enough...worked right away! So, by now the 128 GB card ordered May 2, is well past its "return by" date, when I determine it is defective. Now what do I do? Searched on Amazon, but found no instructions for this situation.
Giving it 1 star in hopes this can be rectified. I use SanDisk cards all the time and have never had a problem like this before.

Just found out from SanDisk that this card is a fake - not their product. Guess I am screwed unless Amazon steps up and makes it
good. Need to somehow punish this seller "Lecu Computer" for giving Amazon a bad name and customers a bad product!

1,924 people found this helpful

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The_Chief

GREAT CARD - I doubt I'll ever run out of storage!

Reviewed in the United States on November 10, 2017

Capacity: 400GBVerified Purchase

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.

980 people found this helpful

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1212 comments

Richard Macias

400GB for my switch!

Reviewed in the United States on September 25, 2018

Capacity: 400GBVerified Purchase

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.

114 people found this helpful

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22 comments

Robert Mauro

Don't buy unless it's 2nd revision/version.

Reviewed in the United States on July 31, 2018

Capacity: 400GBVerified Purchase

11 months in, and the times the card is not recognized or errors or locks up my devices are increasing. Additionally, minimal use makes the card heat up considerably. I'm beginning to wonder if this is a fake, or just another case of SanDisk's first run being garbage like their original 128GB cards (which I *also* had to replace in under a year).

I've ordered 14 SanDisk memory cards (eight micro SD, four SD and two USB sticks) and I am once again regretting that I bought a first run/first revision card. The others work great, but every first revision/first run card of theirs has failed and exhibited crazy heat issue in under a year.

96 people found this helpful

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11 comment

A. J.

Compatible with everything I've tried and super fast for 4k Video!

Reviewed in the United States on April 23, 2018

Capacity: 400GBVerified Purchase

Bought this for my Paralenz underwater camera that shoots up to 4K 30fps.

My camera manufacturer says 128gb V30 is the required max but this card is rated for a min of 10mb/sec & and the write speed is undocumented publicly after contacting Sandisk, with transfer speeds to 100mb/sec.

Maybe they won't release write speeds because it performs so well they don't want it competing with their faster rated cards?.... just speculation of course!

But this card performs flawless... not only in my Galaxy Note 4 phone but also in my camera. Leave it formatted in the default exFat and your good!

After much research it appears its only weakness may be in burst abilities for use as internal memory but sustained transfer rates are great!... so much so that 4k @ 30fps video was no problem in testing.

I'm also astonished this card works so well in my Note 4, I had a 128gb Sandisk in before and this definitely feels faster.

At this point I have the highest recommendations for this card.... you can now store mass amounts of 4K footage.... according to my tests so far, about 10+ Hrs of 4K @ 30 fps!

I've found other brands often give similar speeds as compared to Sandisk but fail miserably long term in reliability.... Do you really want 400 GB worth of stuff lost because you wanted to save a few bucks with another brand?

Sandisk is the most reliable IMO and it's amazing they remain at the front of the pack.

It's not the fastest dog out of the gate that wins, but the one who can make it to the finish line first!

I own 3 of these now.
I can film 2.7k @ 60fps and put 17 one hour dives in a week long dive vacation and I only use about 180gig!

Its great not having to tote a big laptop on my trips!

I have one just for backup too on my trips .. Haven't had to use it yet!

63 people found this helpful

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0Comment

Amazon Customer

Would not read, but melted nicely.

Reviewed in the United States on July 5, 2018

Capacity: 400GBVerified Purchase

The card was sent to me by a family member in an undamaged condition. Prior to purchase, no one (including SanDisk, Canon or Acer) could confirm it would work in my Cannon 80D Canon camera or a new Acer Swift 3 FAST lap top, but I bought it anyway. On arrival - a now 2 year old PC would not read it, but made it HOT. The Acer Swift 3 could also not read it, so I placed it in the Canon 80D, where upon it started to melt the cards adapter. The melting plastic trapped it inside the card adapter, but I was able to slowly remove it, to see it burned itself on both sides and created a center 'crack'. What more can I say? Oh yeah - I was unable to find any review on the web confirming it would or would NOT work on the devices mentioned - terrible!

34 people found this helpful

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11 comment

Flyin'Hawaiian

Not a fake!

Reviewed in the United States on January 10, 2019

Capacity: 400GBVerified Purchase

With the price of $88.00, I was skeptical that this may not be a real card, but I went ahead and ordered it anyways. After all, Amazon has a great return policy, so its not like I'd be out any money.
Received the card today and first thing I did was do a little verification on it. First, a quick test with Crystal Disk Mark, testing sequential rear/write with a 4gb file, it passed with flying colors!
Okay, now for the big test, will it hold a full 400 gigs of data? Open H2TestW and ran a full test on the card (ignore the 1mb extra on the disk that it didn't test, don't ask me why it does this!), 3½ hours later, I have the answer, it works exactly as it should!
Am now copying over my music files, well, at least 330gb of it, which leaves me easily 30+gb for photos and video, which is way more than enough for my use!
Just to make sure we're all on the same page here, the photos are of what I received, as well as screen shots of the two tests I performed. If you received anything different, I'd suggest testing the card before using it.
Overall, I'm happy with this card for its price! Its replacing a 256gb Samsung Evo card that's been in my Galaxy S7 for about a year, I'll use it elsewhere since there's nothing wrong with that one either.

20 people found this helpful

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11 comment

kendor

Nearly "unlimited" storage, works well on a Samsung Note 9

Reviewed in the United States on January 28, 2019

Capacity: 400GBVerified Purchase

Summary: the SanDisk Ultra 400GB seamlessly adds what amounts to unlimited storage for your phone. I've had it installed and working well on a Samsung Note 9 for the last three months.

After putting the SanDisk Ultra 400GB in place on my Samsung Note 9 , I don't think I'll ever run out of space on my phone. I love this: I never really have to download pictures or video from my phone, and I can permanently store whatever movies, documents, or other files I wish. Even after shooting thousands of photos and hours of video, I have hundreds of gigabytes of free space left.

On the Samsung Note 9, the 400GB card reports 366.8 GB of free space after formatting. Using a speed testing application, my card reports write speeds of 48 MB/s and read speeds of 86 MB/s.

Suggestions:
* After purchase, get an SD card speed testing application to verify that your card isn't fake, and that its performance approaches SanDisk's hyped theoretical maximum. Don't be put off if you don't reach 100 MB/s or whatever the advertised maximum speed might be; you just want to be somewhere in the ballpark. If you are using Android, you can download an excellent SD cart-testing application from the Play store called "SD Card Test."

* On some Android devices you can further verify that you have a legitimate (not fake) card by downloading an application called SD Insight (note this app is not compatible with the Galaxy Note 9 and some other late-model Android devices.)

note: I was *not* solicited to write this review, and I bought this product with my own money. I received no compensation for this review and indeed I have no idea who the seller might be. I pride myself on writing unbiased reviews.

16 people found this helpful

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Bryan

Two and both Error

Reviewed in the United States on November 7, 2018

Capacity: 400GBVerified Purchase

I have two of these, BOTH of them error when copying data from a PC to the card. The card constantly disconnects from the OS, then you have to reinsert it, start copying, and it does it again. Some of the videos that I copied over work on the original PC but then when I copy it successfully to the SD card, they don't work. It took me 4 days to copy over 80GB worth of data because it got to the point that I had to start copying individual files over so they would not error out or the card would stop being read.

17 people found this helpful

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11 comment

I Like StuffTop Contributor: Action Figures

400GB Nintendo Switch!

Reviewed in the United States on September 4, 2018

Capacity: 400GBVerified Purchase

I thought 200gb would have been more than enough for the lifetime of my Nintendo Switch but apparently not. I decided to just upgrade to the 400gb so I won’t have to worry about space on the Switch for a while.

I transferred all of my files through my computer and although it took a while, it transferred fairly easily.

I’ve used Sandisk flash drives and memory cards for years now and have always appreciated the quality of product they put out. I wouldn’t likely use a card this big for my mirrorless camera unless I was going to shoot a lot of 4K but normally I don’t like having large capacity cards with too many of my photos on them.

So far it’s worked great and I think the price was actually pretty reasonable so it’s never been a problem for me to hesitate Sandisk products.

16 people found this helpful

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0Comment

Morgan Fleur De Lys

Placed in Nintendo Switch, Got 363 GB of Usable Space

Reviewed in the United States on December 3, 2018

Capacity: 400GBVerified Purchase

So these cards, like many like them are always advertised based on technicalities and I don't like that. So when it says 400 GB be aware you're never going to get that.

I bought this card because at the time of purchase this was the highest capacity card that's compatible with the Nintendo Switch. I bought a used one to save a bit of money and so far, so good.

When you place it in your Nintendo Switch, you should get about 363 GB of usable space. That's a lot of GB but it's also 37 GB less than the capacity SanDIsk is marketing it as and for that reason alone, because 37 GB is not a trivial amount, I'm giving this card a 4-star rating.

Other than that, it's fine.

Finally, your Nintendo Switch will need to do a software update in order to use this card but don't worry because it will do it automatically and with just a few button clicks you'll be good to go within seconds.

NOTE: This card inserts at the bottom of your Switch under the kickstand, NOT on top where the games go.

15 people found this helpful

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33 comments

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