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  • peevee - Wednesday, November 8, 2017 - link

    Very useful, thanks!
  • ET - Wednesday, November 8, 2017 - link

    How do you explain the Extreme MicroSD's write performance in apps? Caching? It's way ahead of the pack for application use and costs a fraction of the Pro's price.
  • ganeshts - Wednesday, November 8, 2017 - link

    Yes, it was anomalous, and I have to say caching was responsible. I repeated the test sequence thrice with testbed resets inbetween, but the numbers were always similar. Unfortunately, without any way to confirm caching as the issue, I couldn't mention that in the review text.

    Also, note that the Extreme microSD is A1-class, and other microSD cards weren't optimized for the new performance class. So, the controller firmware could be responsible too.
  • imaheadcase - Wednesday, November 8, 2017 - link

    I had to get one of these Extreme Pro versions for my 1080p 60fps camera. Even with it i get the dreaded "writing data to disk please wait" shown on camera when using it.

    I suspect SD cards for video are going to be replaced by something else like a pure micro SSD.
  • imaheadcase - Wednesday, November 8, 2017 - link

    Speaking of memory cards, do you know why you can't read multiple ones at a time in win 10? Also how come you can't by a reader for multiple ones at a time? You can by hundreds of those "all-in-one" doggles but can only read one at a time in windows 10 for some reason..
  • DanNeely - Wednesday, November 8, 2017 - link

    Is it just a W10 issue, or are you limited the same way in other OSes?
  • imaheadcase - Thursday, November 9, 2017 - link

    No other OS to try on. But I'm not sure when Win10 would even do this. Unless for some reason its not allowed simply because of saturated bandwidth if more than one.
  • ddrіver - Sunday, November 12, 2017 - link

    For me it works fine. My preactivated ISO has some extra mods and stuff integrated so maybe that fixes it...
  • "Bullwinkle J Moose" - Wednesday, November 8, 2017 - link

    With the lack of information you provided, we could only guess

    Are you trying to read 2 cards from a single USB port or hub?
    That would be a problem

    Have you tried 2 separate card readers on two independent USB ports?
  • "Bullwinkle J Moose" - Wednesday, November 8, 2017 - link

    Yes, you CAN buy hundreds of all-in-one dongles but you can only read one card at a time on a single port!
  • imaheadcase - Thursday, November 9, 2017 - link

    I mentioned both those things..You can read ONE memory card micro, or two if one is used in small case as one. Thats it.

    While it seems like no big deal, it takes quite a long time to transfer over them already. If someone sold a single, multiport micro SD card reader to use they would make millions. lol
  • Liltorp - Thursday, November 9, 2017 - link

    Might not be the card that limits you. Often it is the camera and it's interface to the card. Unless you KNOW that some cards can bring this performance.
  • Railgun - Sunday, November 12, 2017 - link

    The issues with these tests and using them as a baseline for camera usage is that’s it doesn’t take into account the camera HW itself. While generally using the fastest card you can will help, generally the camera will write slower, sometimes considerably than these kinds of tests suggest.
  • ET - Thursday, November 9, 2017 - link

    Thanks for the A1 mention. I didn't see that mentioned in the article, and it indeed explains the results. It doesn't matter how it's achieved (cache of otherwise), but it defines a minimum number of IOPS, and that should do the trick.
  • MamiyaOtaru - Wednesday, November 8, 2017 - link

    glad there are at least some random 4k write numbers (CrystalDiskMark screenshots) for those cases where they are used as primary storage, in a Raspberry Pi for instance. Can't expect too much from an SDXC card of course, but some of them are so much worse than others
  • Sarah Terra - Wednesday, November 8, 2017 - link

    3+ year old tech unfortunately

    The extreme pro series has not been updated in quite some time.
  • Gee Ham - Wednesday, November 8, 2017 - link

    Which is the best SD and SDmicro card, because I still don't understand the technical information.
  • Lolimaster - Thursday, November 9, 2017 - link

    For cameras and video cameras I think SD card should be replace by something like compact m.2 SSD's, even sata 250MB/s should be overkill with tons of 4K random writes improvements.
  • SanX - Sunday, November 12, 2017 - link

    Ok, do the test
    1) how many rewrites it will survive. 30, 20? Or just 10?
    2) Do another test: pull the card without Eject. After how many such typical usage events it is dead?

    This kind of overpriced junk does not last.
  • acmarketapk - Wednesday, November 22, 2017 - link

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  • ravib123 - Sunday, November 11, 2018 - link

    THIS IS A STRICTLY DO NOT BUY PRODUCT.

    Sandisk doesn’t honor their warranties and has a high failure rate. I had to give up on the warranty and buy intel/samsung/micron who do honor their warranties.

    Lessons learned.

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