SanDisk Extreme Pro SDXC UHS-I U3 A2 V30 128GB + Adapter, SDSQXCY-128G-GN6MA

For this review, I will be testing with a Transcend RDF8 card reader. This reader tops out at around 93MB/s for sustained reads and writes (short bursts can reach 97MB/s), thus it is not capable of testing the max read speed of the micro SD card, but if it can consistently saturate the card reader across the drive, then it is a good indication of a genuine card.For my testing I used AIDA64 with a linear write test from 0 to 100% fill. I find this to be a better way to test SD cards since it allows you to determine when a card is a fake or using QLC NAND, or very poorly binned TLC where only part of the capacity of the drive will perform at advertised speeds.For reference, I performed some testing using my old 64GB Sandisk Extreme Pro micro SD card that I have confirmed to be genuine, and a key thing you will notice is consistent linear reads and writes across the entire capacity of the drive. The 64GB Extreme Pro has a slower write speed than the 128GB model, thus the true max write speed is measured.Genuine Extreme Pro drives accomplish this by ensuring that the NAND is not a bottleneck for the controller, thus even as it gets full, it can maintain its write speeds.Common counterfeit behaviors are cards that perform fast for a first few GB and then become very slow (Basically allocating part of the NAND in a pseudo SLC mode before you encounter the bad QLC performance). Other methods are taking a decent NAND bin that is a low capacity, e.g., taking a 32GB NAND package and formatting a 128GB+ partition table. In those cases a drive can benchmark well but corrupt all data as soon as you exceed its actual capacity.Genuine reference (64GB Sandisk Extreme Pro micro SD) (I attached and labeled screenshots of the AIDA64 test):Average read speed across the entire drive: 92.7MB/sAverage write speed across the entire drive: 87.5MB/sNext I tested the 128GB Sandisk Extreme Pro micro SD card with the same Transcend RDF8 card reader. As expected, writes will be bottlenecked by the reader.Average read speed across the entire drive: 93MB/sAverage write speed across the entire drive: 86.8MB/sOverall, from my testing the card I received seems to be genuine, and the performance is in line with other Sandisk Extreme Pro micro SD cards. While I am unable to test the full read speed, I am able to confirm that the write performance is consistent with none of the telltale behaviors of low quality NAND.As a final note, fakes will always change. Companies that make counterfeit cards can see examples of genuine ones and adjust their process to match the genuine part visually. What they can’t fake, is the performance, consistency, and capacity all at the same time. Know the limits of your card reader and test within those limits to ascertain whether your card is genuine or not. Counterfeit cards have the most trouble with write performance and consistency, thus longer write tests are most important.For further testing, I used the card in my android smartphone, and it performed very well. Since Android is designed around limiting micro SD card use to tasks which have a lower IOPS demand by default. The vast majority of use cases will be for bulk storage, and saving larger files such as when you record 4K video.The card had no problem keeping up with raw files being captured, as well as 4K video at 100Mbps (well within the write speed limit of the card (which in terms of Mbps, would be in the 700Mbps range)Due to the performance and verification of it being genuine, I rate it 5 stars.

Great product, does what description says, arrived on time.

solved my problem.... works well. good price

Excelente producto

Son las mismas características que ofrecen buena velocidad y es la capacidad

My review is focused on the authenticity of this Extreme PRO micro SDXC A2 U3 and its performance vs. SanDisk claims.After purchasing this card, I looked online for ways to test its performance and I highly recommend that you do the same. There are plenty of fake SD cards being sold including from large online retailers such as this one. This is often and likely not the seller trying to scam buyers, but rather their vendor that opted for a sub-par product.My pursuit to find out if this indeed was a good purchase was not only driven by my curiosity, but by the mere fact that I find it difficult to justify paying $27 for something so small that you can smuggle it into a prison ..even with a full body cavity search. How did nobody think of this when Epstein allegedly offed himself?After watching a number of youtube videos, I downloaded several testing tools and ran my tests.Before I get into the testing, let me point to some of the more obvious physical aspects of a fake microSD card vs. a genuine one.1) On the outside of the package, look for misspelled words and generally things that stand out as low quality: print, images, and packaging seal.2) After you open the package, make sure the card and reader in the plastic form are sealed with a thin plastic on the back of it.3) The back of the reader should have a date and below that it should say, “Made is China.” The back of the microSD card should have a serial number and “Made is China” below that. Both are printed onto the plastic and are not stickers.4) On the back exterior of the package, in the top right corner, is a round icon that says, “Includes RescuePRO DELUXE 2-YEAR SOFTWARE DOWNLOAD OFFER.” When you open the package, you will see the sticker for this offer on the inside of the front of the package. If this sticker is missing or is instead “printed” onto the inside of that package, your SD is fake.Now, on to performance testing… You need to do this! And, be sure to do your testing before adding any data to the card. Though, you need to format the card first and if you’re formatting it via your phone, ONLY format it as an EXTERNAL STORAGE device. If you format it as internal storage, it will get encrypted and you will not be able to test it on any other device, other than the phone, nor will you be able to reverse this formatting choice. External Storage is also the recommendation from SanDisk.There are a bunch of free tools you can download and run on your PC for testing an SD card. And, there are some you can run on your smartphone. I’m not going to cover all of these, but I will touch base on the three I used. These tools are not great, though they will confirm if you got a genuine card and, they will set “real” expectations for your card’s Read and Write capabilities.First and foremost, back-up your computer and scan any & all software you download, before you install it. DO NOT skip this step!ChipGenius – this is a simple program that reads the manufacturer information on the card and displays it. This did not work for me on any level. Why? Because I do not have a slot for the SD card reader to insert into the laptop. Instead, I initially had to use a USB 3.0 adapter as an intermediary and ChipGenius came back giving me information on the USB flash drive as opposed to the reader and card plugged into it.And, a similar result when using the intermediary SanDisk USB reader (more on this below). Regardless, the manufacturer’s info can be altered using a disassembler app, so this tool is not great for affirming a fake, though it could be of value when used in conjunction with other tools.H2testw – this is an older program that still works and is popular. It is designed for XP and Vista, though it worked fine on my Win10. The program writes to and reads from the card. Unfortunately, this takes about 49 minutes for each test of Read & Write. I ran the test twice and got similar results. And, I ran it again using the SanDisk USB reader and the results on the Read were significantly better, though still not close to SanDisk claims.CrystalDiskMark – I called SanDisk and this is the tool their tech support recommended. It is a bit nicer layout and much faster than the H2testw, though I could not find a Win10 version. The 64bit XP version I downloaded worked well. I ran the tool several times.The results for H2testw were somewhat different from those of CrystalDiskMark, especially on the Read of the card. However, these results were all fairly consistent with those of the different performance-testing youtube videos I watched for this same card. In other words, 86 to 95 Mb/s on Read and 81 to 87 Mb/s on Write.Those numbers, and specifically the Read stats, are a far, FAR.. reach for the claims of what SanDisk says they are! The Read stats are HALF of what SanDisk says they should be. I know that the package says, “up to” those speeds, but that is what they should be when testing an empty card on a relatively new & fast laptop/PC. If you apply the same percentage for the Write results to the Read stats, they should be 153 to 164 Mb/s.I was somewhat surprised and a bit disappointed at the actual test results vs. the SanDisk claim. I started wondering if a different testing tool would produce different results and/or if perhaps this has something to do with my testing set-up. So, I contacted SanDisk and they sent me a new microSD card that performed the same on all these tests. After that, they sent me a SanDisk USB reader.I ran all of the performance tests using this SanDisk USB reader this time and the test results using CrystalDiskMark software exceeded the SanDisk claims for Read & Write speeds. See all of the attached photos.Now, as I see it, the real issue here is that SanDisk includes a cheap, flat card reader, which is not compatible with any device made today. In other words, you need an intermediary USB reader/adapter to actually test the card. And!, if you do not have one like the one SanDisk sent me (their own brand), your test results will not accurately reflect the Read & Write speeds of the card you bought.I’m giving this microSD card a 4 out of 5 stars because the thin, flat reader included with the card is basically a half-measure and of little value without that SanDisk USB reader. And, because I had to contact SanDisk to get this performance issue resolved, which took almost three months.Though despite the loss of time and related aggravation, this is a good card and worth the price. If you’ve read thus far, I thank you for your time and hope that my review is of value to you.

I paid much more for Lexar 1800x and ProGrade microSDXC cards in 128GB versions. I still receive warnings from my drones that my microSDXC card is slow when recording 6k and 4k video. Using this card in all my drones and my DJI Crystalsky UltraBright 7.8" android monitor, I have yet to see that message which is perplexing, but that is the observable result. The other two manufacturers boast much faster read and write times for their microSDXC performance, yet this card remains my fastest R/W performer. I am not sure how, but I am not complaining either. For whatever reason, if you are using this card in a higher-end drone, this is a solid choice microSDXC to use. For the money and storage capacity, it's a very good deal. I am slowly migrating over to these cards full time, one at a time.

I bought this in 2020 and it's still going strong, no complaints.