Amazon.com: Customer reviews: SanDisk 256GB 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!

3,132 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!

1,922 people found this helpful

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Noodler's Pen

The first one started getting errors after about 6 months of use and then went bad within a year

Reviewed in the United States on July 11, 2018

Capacity: 200GBVerified Purchase

This is actually the second of three of these cards that I own. The first one started getting errors after about 6 months of use and then went bad within a year. Sandisk has a rather convoluted return process. I do give them credit for standing by their warranty service...their warranty is great. While this was bad I bought a second one and I'm using that. After 2 months, I am already getting errors. The product handles video and audio fine. The reason for only 3-stars. I'd rather have a micro-SD card that is reliable. Losing data is not fun. Having one card go bad and now a second card starting to fail, indicates a quality problem.
Update April 2019
So I bought this in July of 2018 and now for the last couple of months I've been getting occasional errors on this. Based on previous experience I am trying to back this up on a regular basis. I am not using the full amount of storage. Formatted capacity now shows as 183 GB and I am only using about 44GB. I am guessing that within a couple of months this one is going to fail as well.

23 people found this helpful

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Aftermath

I may have judged too quickly, "MAY HAVE"...

Reviewed in the United States on November 16, 2018

Capacity: 128GBVerified Purchase

Update: August 13, 2019, Tuesday

After a purchasing this same memory card from another buyer, it's been shown that some of those Micro SD cards have to be compatible on both the device being used to record, and the one used to replay/playback the recordings. To access the full span of the 128gb, some devices (like the security camera I purchased the Micro SD card for) can only read up to 32gigs of memory no matter how much memory is on the card. SO it is possible that I was using a device that can only read up to 32gigs at a time. I haven't repurchased this item from this supplier so as not to leave it up to chance, although I will update them from 1 stars to 3 stars simply due to my own lack of knowledge at the time. Perhaps their product did work as expected...Possibly.....

Original Post:
I purchased what I thought was this item on Friday November 2, 2018 and thought it was a great deal because it was cheap. I read other reviews about even cheaper ones selling for $7-$12 that said those were a scam and not the actual product. So I thought that since this one was priced at $22.25 at the time, that this one was legit. THIS MEMORY CARD IS NOT THE 128GB MICRO SD CARD as advertised. To make sure I was not falling victim to the scams the other reviews talked about, I tried to transfer something well over 32gigs (40+ GIGS) just to be sure. It told me I needed 14.4 more gigs to copy it. That's strange......seeing as how this is advertised as a 128gb Micro Sd Memory Card. AGAIN, THIS IS NOT THE 128GB MICRO SD MEMORY CARD AS ADVERTISED!!! DO NOT BUY THIS IF YOU THINK YOU'RE GETTING A GOOD BARGAIN. THAT'S NOT THIS PRODUCT!!!!

14 people found this helpful

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Dado21

Read/Write speeds low with H2testw

Reviewed in the United States on July 10, 2018

Capacity: 128GBVerified Purchase

I ran H2testw to verify storage space. It read 121GB but the transfers speed were not even close to the up to 100mb/s. The write speed was 18.3mb/s and read was 28.3mb/s. I am glad it at least was almost full storage but disappointed on the read/write speeds. For this price I am going to keep it but not as advertised on speeds.

15 people found this helpful

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11 comment

Devin Warner

Came as Expected... Mostly

Reviewed in the United States on November 28, 2018

Capacity: 400GBVerified Purchase

I've heard horror stories of faulty/fake/wrong SD's being delivered instead of the real deal, and I'm pleased to say I had no such issues. It's a SanDisk SD, and for the most part it's everything I expect. However, unfortunately, it's packing only ~366 GB of space, which is, IMO, lower than it should be considering it's a 400 GB card. I know it's almost always a tad bit lower than advertised, but 34 GB seems like a lot of lost space. As such, I'm shaving off a couple stars.

I purchased the SD card for my Nintendo Switch, which of course was an insanely easy installation process (I had no photos or videos to transfer over so it made things even simpler). Better yet, I got this during a holiday deal for like ~$150 off, so all in all it's not like I lost much from the missing 34GB. That being said, there's no way I'd buy this full price moving forward and I'll continue to wait for sales on items like these to compensate for the lost space.

11 people found this helpful

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11 comment

Kevin Jones

Misleading Size

Reviewed in the United States on March 11, 2019

Capacity: 400GBVerified Purchase

400 GB is really 367 GB. While, technically, the card does contain 400 gigabytes of storage (as in 400 billion bytes), this is misleading since operating systems have never reported the actual number of bytes this way. Rather, they use the binary system where one GB is 1024 to the third power or 1,073,741,824 bytes. Mount this card on any operating system and the amount of storage is shown as 367 MB. This is what we are all used to since computing devices were invented and these cards are used in these computing devices that report their capacity in the binary form. So why continue the deception? More sales equals more money. Or, put another way, one company started doing it and now they all do it and no one company will do it correctly for fear that they will lose their competitiveness.

When I read the manual for my device and it says "Maximum capacity allowed on the SD card is x GB." then I trust that I need to get an SD card that is X GB if I want to fully utilize that feature. I don't want have to try to figure out that, to get X GB, I have to look for a card that has X * 1.??? GB. In fact, you can't even get a card that has X * 1.??? GB because the manufacturers make cards with capacities like 64, 128, 200, 256, 400, etc. So, essentially, we're getting screwed out of some percentage of storage because the card manufacturers want to play a different game than the entire rest of the industry.

8 people found this helpful

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22 comments

Joe Cussack

Average speeds, different devices or hardware did not change speed much

Reviewed in the United States on December 1, 2017

Capacity: 200GBVerified Purchase

To start off with if you are expecting to get WRITE speeds of 100 mb/s forget it, a card like this would be much higher in price.
However i knew beforehand this would not get these WRITE speeds but i was hoping i could get the 100mb/s read speeds but i did not.

I only tried it on my desktop using a usb.3.0 card reader ( from trascend)
Write speeds were 23.5 mb/s
read speeds were 32.0 mb/s

For reference it took 2 hrs and 13 min to fill up the entire card with data, and 1 hr 37 min to read it.
Using this on a phone ( samsung galaxy s5) it wasn't too different, the write speeds actually droped to 20 mb/s while the read speeds jumped a bit higher to about 40 mbs. Please note ''up to 100 mbs speeds'' means potentially not promised however i could not even get half of the potential speed.

Overall if you can get this card below $60 go for it ( i never thought id say this for a 200 gb micro sd card!) , otherwise if speed is important to you go with a faster card probably the sandisk ''extreme'' line which normally have a gold color ( but x3 times more expensive)

I am not entirely disappointing with the card, mine was for simple use but anything actually requiring the speed may want to hold off.

for those people that doesn't understand how hard drive and memory formatting work ill list the formated exfat size so you know the actual size formatted : 183GB

72 people found this helpful

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0Comment

Troy, just troy.

Wish they had better wear leveling and more read/write cycle ability.

Reviewed in the United States on October 4, 2017

Capacity: 32GBVerified Purchase

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.

104 people found this helpful

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55 comments

Deltaforce

Genuine 200GB card but abysmal writing and reading speed

Reviewed in the United States on October 28, 2018

Capacity: 200GBVerified Purchase

I have too many cards of various sizes to count. Majority of the cards I have are from Sandisk and none has ever failed on me. For me, this is a trustworthy brand. I noticed 200GB card for cheapest it had ever been, for $35, I grabbed one. Total usable capacity is 183GB.

It had been sitting in a drawer for almost a month. Since today was the last day to return the card, I thought, I should check to make sure its not DOA or a fake one. Passed authenticity test by 2 applications (Flash drive tester 1.14 and h2testw_1.4) but writing and reading speeds are very low. Don't stand the 'grade' given by Sandisk. I really doubt it will work for shooting 4K videos or even regular videos.

I will update as I use it, should it fail or something else happens.

6 people found this helpful

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The manufacturer commented on the review below

Gadget

Don't use in Security Cameras !!

Reviewed in the United States on February 14, 2019

Capacity: 128GBVerified Purchase

I have always loved Sandisk products. I choose to populate my 9 security cameras with the 128GB Ultra Micro SD cards. Well I made a mistake. Six of the nine Micro SD cards failed last week. Weird !! Well, it turns out that Sandisk does not warranty this retail card in security cameras. I purchased from Amazon I read everything included in the product description and I don't remember seeing not to use in security cameras. Sure enough it does say that on the warranty page on their website now. Anyway the cards are 8 months old and are bricked due to a limited number of writes.

Hope this helps some in the future.

Gadget

5 people found this helpful

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11 comment

Chicago John

Great design, specs, and customer service but I had a problem connecting to WiFi

Reviewed in the United States on December 12, 2018

Capacity: 64GBVerified Purchase

This appears to be a very nice, well thought-out design and I really wanted it to work for us. I was unable to get it to connect to our wireless router, however. In this process, I reached out to both Chris and Jack, and they did an outstanding job of quickly responding to my situation with advice. But ultimately we concluded there was some unknown compatibility problem and the immediately refunded my through Amazon. Can't ask for more than that. The instructions are a bit hard to follow so I'll share what I learned step by step. Before starting, check your wireless router via IP address browser connect to make sure you will only be accessing 2.4GHz (if you have a dual band router) by either assigning different SSID's to 2.4 and 5GHz or disabling 5GHz. Make sure your router is set for Dynamic Protocol. Save and exit. Then (1) download Littlelf app from Google Playstore, install, and set up account with name and password (requires e-mail for verification and code). (2) Set your cell phone location to "device only, GPS" for purposes of the installation. (3) Select the "wireless" installation option on the Littlelf app.and select the correct SSID and Password for your 2.4GHz WiFi radio line (4) Turn up the volume on your cell phone all the way. (5) turn on the camera and wait a minute for it to power up and for the red LED to flash, then press and hold the reset button for 2 seconds with a bent paperclip or other thin wire until you hear two "beeps". (6) A timer will start running when you proceed and the cell phone will send SSID and password information via a chirping sound to the camera, so hold the camera mic close to your cell phone speaker. (7) When the information is successfully received by the camera, it will make a "ding-dong" sound and the red LED will turn green. (8) Hit "next" on the phone app when prompted based on hearing the ding-dong sound. (8) Another timer will then count down from 120S as the camera tries to connect to your router. This is where mine failed. Hopefully yours will connect successfully. If not, Chris and Jack will be ready to help you.

2 people found this helpful

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SanDisk 256GB Ultra microSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-256G-GN6MA

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