5 Stars By Sporty on 2016-06-15
Meets advertised speeds. 64GB, 128GB and 256GB comparison
Update 8/25/2016: Added the 256GB card to the comparison. It was much faster write speed and met the 95 MB/s read and 90MB/s write claims!
I tested the 64GB and 128GB cards. Both cards exceeded the advertised speeds (80MB/s read and 20MB/s write). The 64GB card provided higher read and write speeds compared with the 128GB card. The 64GB card showed very high 512K random read and write speeds, the random write speeds exceeded the sequential writes.
I tested in several different USB 3.0 card readers, the highest benchmarks:
EVO Select 64GB
Sequential Read : 97.361 MB/s
Sequential Write : 25.626 MB/s
Random Read 512KB : 88.232 MB/s
Random Write 512KB : 64.917 MB/s
Random Read 4KB (QD=1) : 9.424 MB/s [ 2300.8 IOPS]
Random Write 4KB (QD=1) : 1.717 MB/s [ 419.2 IOPS]
Random Read 4KB (QD=32) : 10.423 MB/s [ 2544.8 IOPS]
Random Write 4KB (QD=32) : 1.445 MB/s [ 352.8 IOPS]
EVO Select 128GB
Sequential Read : 82.839 MB/s
Sequential Write : 22.677 MB/s
Random Read 512KB : 72.126 MB/s
Random Write 512KB : 5.837 MB/s
Random Read 4KB (QD=1) : 4.969 MB/s [ 1213.1 IOPS]
Random Write 4KB (QD=1) : 0.898 MB/s [ 219.3 IOPS]
Random Read 4KB (QD=32) : 5.396 MB/s [ 1317.3 IOPS]
Random Write 4KB (QD=32) : 0.122 MB/s [ 29.8 IOPS]
EVO Select 256GB
Sequential Read : 95.664 MB/s
Sequential Write : 89.637 MB/s
Random Read 512KB : 82.579 MB/s
Random Write 512KB : 54.243 MB/s
Random Read 4KB (QD=1) : 5.931 MB/s [ 1448.1 IOPS]
Random Write 4KB (QD=1) : 2.820 MB/s [ 688.4 IOPS]
Random Read 4KB (QD=32) : 8.474 MB/s [ 2068.8 IOPS]
Random Write 4KB (QD=32) : 3.596 MB/s [ 878.0 IOPS]
3 Stars By arnaud lacour on 2017-02-16
Great capacity, consistent performance, falls short of U1 spec by a hair
I have spent more time than I would otherwise do to test this card because there is so much uncertainty these days with the quality of products, especially with counterfeits flooding the market.
This card is genuine and legit.
The test below shows something a little different than what the benchmark tools will reveal.
This is closer to the real performance you are likely to get when recording video on the card.
Video is usually buffered and written in fairly large chunks to the storage because that is the use that yields the best real life results.
With regular SD speed classes becoming increasingly less readable for consumers, the U classes came to simplify the landscape a bit and U1 is meant to indicate that a card support AT LEAST 10 MBps throughput. This one here falls short, albeit by a very small margin, but short none the less. I have written 1GB files in 100 iterations to both test that the card had the indicated capacity and that performance held throughout.
I am pleased with the consistency,
but displeased by the fact that it consistently misses the mark by a hair.
2 Stars By Joshua Szanto on 2017-04-13
Unable to write data 28 weeks and 4 days later - can still read data
28 weeks and 4 days from purchase this Micro SD card ceased being able to write data. I've kept it installed only in my phone, so it never has gotten removed until now. I can still read data off of it, but I am unable to write data (including delete, full format, and quick format).
1 Stars By Chris on 2017-12-10
Card Unusable After 1 Year
The card has become damaged in some way so that I can not write to the card at all, which is impressive as it's been in a Samsung phone since I got it. The product lasting just slightly over a year is both annoying and almost typical of any situation like this.
The card doesn't appear to be damaged on the outside, but Windows finds (and can't fix) errors on the card, and my phone doesn't notice anything wrong when it comes to writing to it, the problem comes when trying to find what you just put on the SD card.
The files can still be read, but nothing new can be written to it and nothing can be deleted (even using secure deleting software). Windows says it can't be formatted, and using 3rd Party software on Windows as well as trying through Linux doesn't allow me to do anything.
Looking around, the only real solution to the problem is getting a new card, copying the files over and physically breaking the SD card so the files can't be accessed when you throw it away.
1 Stars By rossana morelli on 2017-04-21
Great waste of my time
The product we were shipped is a 64 gig. the front of the card reads 64 GB, but the back has a second self made sticker not from manufacturer that says its 128G , very strange someone made a mistake when skewing inventory in the warehouse. I sent message and no response. Great waste of my time, Deserves 0 stars.
4 Stars By Koby on 2017-01-02
This is working as expected. I did have a ...
This is working as expected. I did have a problem when the card locked itself into a write protect state when writing some large files to it. I don't know what caused the problem. I tried a few different types of low level formatting but none worked. Samsung support replied that AlumiGogo warrants these for 10 years and after contacting them, they provided a replacement card and free return shipping for the defective card.
1 Stars By Choco on 2017-05-09
Stopped working properly after a week.
Won't write new files or erase. Can't format.
Bought this item directly from AlumiGogo instead of a seller. Previously tried similar product bought from a seller ended also with same issue but that one lasted longer. Tried getting info from warranty (found out factory warranty won't cover for dash cam use) and look for help on Google but that didn't really help. Going to try a different brand now or stick to my 64 Samsung micro sd.
3 Stars By Chris, a college student on 2017-01-30
Thicker than normal Micro SD card!
It fits very tightly into ports and it's started to scratch the SD Card. At first I thought my port might be tight or something but after trying the SD card in different ports and comparing it to other micro SD cards I discovered it's thicker than normal! I'm not sure why this is the case and I'm worried it will cause problems down to line or might get stuck but other than that it works.
1 Stars By Jared on 2018-01-20
Dead after only a few months of use...
I bought this card in Nov of 2016. It sat in the packaging for almost a year until I got a new phone. It was in use in my Moto G5 Plus from Sept 2017 until Jan of 2018 when it locked down into read only mode and became unformattable. Meaning the controller has died I assume. Pretty short life. I went online to talk to a rep and was told that Samsung doesn't support this particular product directly and forwarded me to a smaller tech support company to file an RMA. This smaller company does not have 24/7 support so that's unfortunate. Doesn't bode well. Will update after the RMA process concludes.
5 Stars By Kodiak on 2017-05-30
Perfect for moving my tunes to my Galaxy S7
When my venerable iPod Classing finally bit the dust a few weeks ago, I decided it was time to move my music collection to my phone. I purchased this card and copied all of my music from iTunes onto the card. Then I installed the card in my Galaxy S7 and both Play Music and AlumiGogo music instantly recognized all of it. Now I have all my tunes with me wherever I go and I don't need to carry a second device anymore...though I do need to remember to take my phone with me when I get out of the car now!