This is definitely a cheap knockoff of the SanDisk Extreme Pro SD cards. The labeling is intended to match the real item, and it looks pretty good, but you can clearly see the difference when comparing the packaging and the SD cards themselves next to each other. The 400GB card shows as having 430gb of storage, which is incorrect.Maximum read/write speeds have been tested at 20mbs/20mbs and the card works, but is very slow compared to the real Extreme Pro cards. These also have a tendency to disconnect during a large transfer and will only come back online once they are unplugged and plugged back in. If you are looking for cheap storage, these work, but if you need actual performance, stay away.

Buy SanDisk only from WD or authorized dealers.

SanDisk are extremely fast exceptional quality Micro SD cards. The 32GB Extreme MicroSD card I bough works beautifully to supplement the internal memory of one of my Android tablets. Also on a side note I bought for my Android phone what I thought was a 128GB version of the SanDisk Extreme Micro SD card on NewEgg and when I got the card it became obvious to me (from the counterfeit packaging and the cards actual performance) that it was not a real SanDisk Memory card. This may sound hyperbolic or unbelievable, but it is 100% true... the majority of the SanDisk memory cards that are sold by third party sellers on sites like NewEgg, Ebay, Amazon and numerous other sites are fake cards... they are countefeit. They may have what appear to be legitimate packaging, the ... MoreSanDisk are extremely fast exceptional quality Micro SD cards. The 32GB Extreme MicroSD card I bough works beautifully to supplement the internal memory of one of my Android tablets. Also on a side note I bought for my Android phone what I thought was a 128GB version of the SanDisk Extreme Micro SD card on NewEgg and when I got the card it became obvious to me (from the counterfeit packaging and the cards actual performance) that it was not a real SanDisk Memory card. This may sound hyperbolic or unbelievable, but it is 100% true... the majority of the SanDisk memory cards that are sold by third party sellers on sites like NewEgg, Ebay, Amazon and numerous other sites are fake cards... they are countefeit. They may have what appear to be legitimate packaging, the card may look identical to an authentic SanDisk card and they may have serial numbers, "made in" and a "CE" marking on the card, but when you actually check the serial numbers with SanDisk'WesterDigital tech support or test the memory card's performance you will find that they are likely inferior counterfeit memory cards from China. Only buy your Sandisk memory cards from Western Digital or one of their approved dealers listed on their website. Don't be fooled or tempted by anyone offering SanDisk Memory cards or other products at prices lower than what they are selling for on the Western Digital website or by one of their authorized dealers... virtually any SanDisk Memory card or product that is priced lower than the Wester Digital or one of their authorized dealers will be an vastly inferior counterfeit card without the speed or memory of an authentic SanDisk card.

Genuine Sandisk Extreme Micro SD 32Gb 100Mb/Sec

Buying memory cards online can be a real minefield - not all are 'as advertised' (just read the reviews on some sites). So it was only after a great deal of sifting and searching and checking selling history etc. that I finally decided to 'chuck-me-buck' in the direction of this particular seller. Have to say that I'm really pleased I did. Sure, there were some available elsewhere at a slightly lower price, but that is small consolation if they prove not to be the real thing and you end up losing your treasured memories. Besides which, I needed the card in a hurry for a trip I had coming up the following week so buying from a local seller seemed the sensible choice. Being Mr. Skeptical, the first thing I did on receiving the item (2 days after placing the order) was ... MoreBuying memory cards online can be a real minefield - not all are 'as advertised' (just read the reviews on some sites). So it was only after a great deal of sifting and searching and checking selling history etc. that I finally decided to 'chuck-me-buck' in the direction of this particular seller. Have to say that I'm really pleased I did. Sure, there were some available elsewhere at a slightly lower price, but that is small consolation if they prove not to be the real thing and you end up losing your treasured memories. Besides which, I needed the card in a hurry for a trip I had coming up the following week so buying from a local seller seemed the sensible choice. Being Mr. Skeptical, the first thing I did on receiving the item (2 days after placing the order) was to check the manufacturer's product packaging - all seemed correct. Next, and more objectively, I checked the read/write and formatting stats using the freely available h2testw_1.4 app (just use your favourite search engine to locate a bona-fide copy, remembering always that: "other products are available..."). Again, all good! Bear in mind though that when formatted, no memory card will display the full available manufacturer stated capacity. So, for a nominal 32Gb card, don't be surprised to see somethinglike 29.7Gb available capacity once formatted. This is normal and does not necessarily indicate a faulty card. So, for my card it all checked out as the genuine article and has been happiliy capturing my adventures on my 'action camera' which I rigged up as a dashcam; managing to completely fill the card over the course of a couple of days. All of my journeys were then replayed and relived on my laptop (sad I know!) without a hitch or glitch. In summary, yes, I'm very pleased with the card and would recommend it and the seller without hesitation. (Purchased from Picstop Jul 2018)

My Go To Memory Cards

If you want a reliable memory card for your photos and videos look no further. I have been using Sandisk memory cards since 2005 with no issues. Sandisk cards have never let me down. I have tried Lexar memory cards but keep coming back to Sandisk. Only thing that has changed which is a bit of an issues is Sandisk no longer gives you a Lifetime access to RescuePRO Deluxe 2 data recovery software. After two years you much pay.

Reliable, Largest capacity in this size so far

I bought two of these. I actually use these for computer file storage because they are so compact and are very covert for portable applications. If you think about it, 5 of these stacked up is the equivalent of 5TB but in under the size of a few coins. It is amazing how far technology has come. The quality is outstanding as usual -no corrupted files, transfers quickly, gets heated when writing very large quantities for a bit of time, but I rarely do that so not an issue. They do seem to keep cool enough to maintain the higher speed so that is good. Remember, to get the best speeds, you need the right readers, usb cables, and ports. This all works together. I have used the 256gb, 512gb, and now 1tb sizes of these and so to extrapolate to past ones I have purchased, ... MoreI bought two of these. I actually use these for computer file storage because they are so compact and are very covert for portable applications. If you think about it, 5 of these stacked up is the equivalent of 5TB but in under the size of a few coins. It is amazing how far technology has come. The quality is outstanding as usual -no corrupted files, transfers quickly, gets heated when writing very large quantities for a bit of time, but I rarely do that so not an issue. They do seem to keep cool enough to maintain the higher speed so that is good. Remember, to get the best speeds, you need the right readers, usb cables, and ports. This all works together. I have used the 256gb, 512gb, and now 1tb sizes of these and so to extrapolate to past ones I have purchased, again, never had issues. When these are on sale, the price is fair. I use my old ones in cameras now and they record 4k video with ease. Can't wait for 2TB haha, or at least 2TB in an SD card since technically it would fit.

Sandisk Extreme A1 V30 UHS-I U3 microSDXC (32GB, Read 100MB/s, Write 60MB/s) (SDSQXAF-032G)

Works perfectly in my Samsung A51. In researching which card to buy I decided I wanted a top performing card that will hopefully last a couple of phones which is what Ive done in the past. So I wanted a card with A2 functionalityfor running apps off the card and I decided on buying at least 128GB for the extra storage capacity and the better speeds that come with the larger sized Extreme cardsIm not positive now but I think it was the 128GB and up had better speed ratings than the 32 and 64GB cards. I purchased the 256GB SanDisk Extreme PLUS because it was the best value at the timeit was on sale. I ordered online and BestBuy shipped to my house. It arrived a few days ahead of the expected delivery date. I first put this into my laptop to transfer several gigs of ... MoreWorks perfectly in my Samsung A51. In researching which card to buy I decided I wanted a top performing card that will hopefully last a couple of phones which is what Ive done in the past. So I wanted a card with A2 functionalityfor running apps off the card and I decided on buying at least 128GB for the extra storage capacity and the better speeds that come with the larger sized Extreme cardsIm not positive now but I think it was the 128GB and up had better speed ratings than the 32 and 64GB cards. I purchased the 256GB SanDisk Extreme PLUS because it was the best value at the timeit was on sale. I ordered online and BestBuy shipped to my house. It arrived a few days ahead of the expected delivery date. I first put this into my laptop to transfer several gigs of music, movies, and pictures onto itusing the included SD card adapter. I then installed it into my phone and moved all my documents, images, videos, and audio to this card combining the new stuff from my laptop with that from my phone. I set it to be the default location for all the file types mentioned, so now, any new stuff goes right to the microsdxc card. I have not installed or used any of the apps offered by SanDisk. I have not performed any bench tests but I dont notice any discernable lag or delays in accessing the data compared to my internal memorywhich is test enough for my needs. Ive yet to install or move apps to the microsdxc card. But the card has been installed for almost 2 months and now that my confidence in this product has been confirmed, I plan to move a few less often used apps to it as well. Overall Im very happy with this purchase.

Sandisk Extreme A1 V30 UHS-I U3 microSDXC (32GB, Read 100MB/s, Write 60MB/s) (SDSQXAF-032G)

Dji recommends the SanDisk Extreme and this one is even a little better being the SanDisk Extreme Plus. The read and right speeds are a little faster on the Extreme Plus. 10MBs faster read and 30MBs faster write than the Extreme card. It was on sale for less than 30 dollars so it was better to get a faster card for 4k video. So far it works perfect with 4k 60 frames on the Dji mavic air 2 drone. Faster speeds should be more future proof and perform better. I have three Sandisk sd cards and all still work great. Beware of buying these cards online at unknown dealers because there are a lot of fake cards that do not perform as well in tests. I felt Best Buy would be the best choice to get a legitimate card and I did test its speeds and they are as advertised or ... MoreDji recommends the SanDisk Extreme and this one is even a little better being the SanDisk Extreme Plus. The read and right speeds are a little faster on the Extreme Plus. 10MBs faster read and 30MBs faster write than the Extreme card. It was on sale for less than 30 dollars so it was better to get a faster card for 4k video. So far it works perfect with 4k 60 frames on the Dji mavic air 2 drone. Faster speeds should be more future proof and perform better. I have three Sandisk sd cards and all still work great. Beware of buying these cards online at unknown dealers because there are a lot of fake cards that do not perform as well in tests. I felt Best Buy would be the best choice to get a legitimate card and I did test its speeds and they are as advertised or faster. Speeds can be a little confusing because the Mavic air 2 records 4k 60fps at 120 mbps. These cards are rated in MBs and 120mbps equals 15MBs. This card has 90MBs write speed so no problem with speed for sure.

Sandisk Extreme A1 V30 UHS-I U3 microSDXC (32GB, Read 100MB/s, Write 60MB/s) (SDSQXAF-032G)

The Samsung and Sandisk 256GB SD cards were on sale for about the same price. The Sandisk is rated at maximum 17090 readwrite in MBs versus the Samsung Evo Plus at 10090. For only 2 more I tried the Sandisk for its higherrated read speed.In actual use I cannot say there is a great difference. I would say both cards are very competitive. Subjectively, the 256GB Sandisk seems somewhat faster than the Samsung 64GB card that it replaced.I ran speed tests on this and Samsung Evo Plus cards using the SD Card Tester app. The device processor and card vintage may have impacted the results.Sandisk 256GB SD845 69.457.7 readwriteSamsung 256GB SD835 50.431.9 card purchased in 2018Samsung 512GB SD865 77.450.2Based on the tests, the Sandisk surprisingly seems to have a slightly ... MoreThe Samsung and Sandisk 256GB SD cards were on sale for about the same price. The Sandisk is rated at maximum 17090 readwrite in MBs versus the Samsung Evo Plus at 10090. For only 2 more I tried the Sandisk for its higherrated read speed.In actual use I cannot say there is a great difference. I would say both cards are very competitive. Subjectively, the 256GB Sandisk seems somewhat faster than the Samsung 64GB card that it replaced.I ran speed tests on this and Samsung Evo Plus cards using the SD Card Tester app. The device processor and card vintage may have impacted the results.Sandisk 256GB SD845 69.457.7 readwriteSamsung 256GB SD835 50.431.9 card purchased in 2018Samsung 512GB SD865 77.450.2Based on the tests, the Sandisk surprisingly seems to have a slightly higher WRITE speed. However, newer cards on newer devices all seem close enough. Since I have rated the Samsung at 5 stars and I am pleased with the Sandisk it also gets 5 stars. They both work fine and you cant go wrong with either.

Speed and capacity as advertised

I ordered 4 of these for use with a Zoom F3 field recorder, even though the Ultras would be enough according to the official F3 compatible cards list. To test functionality and satisfy my curiosity, I benchmarked each one using Blackmagic Disk Speed Test (5GB stress test) and a Transcend RDF8 USB 3.1 Gen 1 Card Reader connected to a Mac with USB 3.0 ports. Each card hit well over the maximum advertised write speed (a couple hit around 67 MB/s) and just under the max read speed. Capacity also shows right above 31.9GB, which is also great. A solid choice if you don't need speeds above those which are advertised. Recommended.

Very disappointed in write performance.

Supposed to "Features up to 95MB/sec. sequential read speed and 90MB/sec. sequential write speed." I ran four tests for read speed and got an average of 80MB/s. The low was 65 and high was 87. Write was average 47, low of 29 and high of 70. One test was H2Testw, which writes and reads to the entire memory card. And another was AJA System Test, which does test writing video in different formats, i.e. 4K was used for this test. Note that one test got a 29, but the minimum should be 30 (V30) I also tried Crystal Disk Mark. On that test, 512MiB, I got Seq Reads of 92.67 and 88.04, and Seq Writes of 27.19, and 38.93. So I am disappointed in read speeds, and very disappointed in write speeds. This is about half the expected write performance.