Thread: Card Reader - transfer rate

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  1. #1 Card Reader - transfer rate 
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    I am using "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards.
    When I copy the Files to my computer I only got around 39 MB/s transfer rate.
    Using "Lexar Professional USB 3.0 Dual-Slot Reader". When I am using an USB 3.0 Stick I got 230 MB/s and more.
    1n.jpg


    Card Reader works fine. I copied the DNG files to another card. (tanscend 90 MB/x / 600x)
    and then copy it back to my PC... and got read spead up to 160 MB/s.
    2_n.jpg

    I got four "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards.
    All the same. Recoding in rar 3:1 slow motion 60fps is fine. No frame dropping.
    So I think the cards are fine.

    Is it normal that the read spead is only at 39 MB/s? Specs show that it must be around 90mb/s.
    And i though read speed is allways faster than write spead. hmmm
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  2. #2  
    Senior Member rick.lang's Avatar
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    The performance on the Lexar Dual Slot reader appears to be USB2 transfer speeds. Perhaps it's not alone on the USB port or something like that so it can't go faster.
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  3. #3  
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    Thanks for the feedback, but it is a USB 3.0 Card Reader. And with other cards I got 160 MB/s
    The "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards" are working fine.
    No dropping frames when shootign raw 3:1 60 fps. Only the read spead sucks.

    It would help if someone else confirm the low read speed. because "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards
    are the recomended one on and many people are using them. It wozuld help to know if other people got better results and what card readers they are using.
    But I don't think it is my PC, and I don't think it is the Reader.

    I think those cards are slow. But it makes no sense. Because often read speed is more than write speed.
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  4. #4  
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    Perhaps the problem is SDXC vs SDHC? Your card reader may not be new enough to be able to use SDXC cards at their proper speeds.

    I use this and it's very fast:
    https://www.amazon.com/WEme-Professi...me+card+reader

    Though there's probably some readers that are even faster now.

    EDIT: Looking around, this reader seems to be the one that's generally recommended:

    https://www.amazon.com/dp/B00VAGX6MW...twwAAAAAV_VvFA
    Last edited by RyLo; 05-23-2017 at 11:16 AM.
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  5. #5  
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    RyLo: Thanks a lot for your replay. I will check it out!
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  6. #6  
    Quote Originally Posted by S_Berger View Post
    I am using "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards.
    When I copy the Files to my computer I only got around 39 MB/s transfer rate.
    Using "Lexar Professional USB 3.0 Dual-Slot Reader". When I am using an USB 3.0 Stick I got 230 MB/s and more.
    1n.jpg


    Card Reader works fine. I copied the DNG files to another card. (tanscend 90 MB/x / 600x)
    and then copy it back to my PC... and got read spead up to 160 MB/s.
    2_n.jpg

    I got four "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" Cards.
    All the same. Recoding in rar 3:1 slow motion 60fps is fine. No frame dropping.
    So I think the cards are fine.

    Is it normal that the read spead is only at 39 MB/s? Specs show that it must be around 90mb/s.
    And i though read speed is allways faster than write spead. hmmm
    I had this same problem with a Lexar cfast reader. Go to "device manager", click "disk drives", right click any/all of your hardrives and cfast reader and click "properties", then go to "policies" and click "better performance" removal policy from the default "quick removal". Also have "enable write caching on the device" checked. Went from 30 MB/sec transfer to a 150 MB transfer (for raw files) without changing the hardware.
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  7. #7  
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    Sorry for the late reply. I did the changes, but could not change "enable write caching on the device". Hardware did not allowed it.
    Still only got "42 MB/sec". Now I ordered some new cardreader:

    "Kingston FCR-HS4 USB 3.0 High-Speed Media Reader"

    For 22,- Bucks. Pretty cheap. Lets see if I got better results with this thing.
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  8. #8  
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    Same Problem with "Kingston FCR-HS4 USB 3.0 High-Speed Media Reader". Only 40 - 44 MB per second.
    Using a new "Gamer PC" with fast SSD, 16GB Ram.
    I am also sure I am using a USB 3.0 Port at the PC and not a USB 2.0.

    Got faster rates with other CARDS:

    I donīt get it.

    I have no droped frames recording 60 FPS raw 3:1 on "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s".

    hmmmm any card recommendation which are faster than the "SanDisk Extreme Pro SDXC UHS*I U3 V30 128 GB 95 MB/s" one?
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  9. #9  
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    I think maybe you didn't understand Rick's answer in #2.
    He wasn't talking about your card reader (you stated it was USB 3)...
    I think he was talking about the computer side of the equation?

    Try a different usb3 port, or better still a different computer with usb3.
    Might not solve your issue but then again it might (be a valuable step in the process of elimination).

    Cheers.
    Tokina 11-20, Sigma 18-35, Rokinon 35, 50, 85, 135, GH4, Lumix 20, 12-35, 35-100, 100-300.
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  10. #10  
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    I am pretty sure it is a USB 3.0 port. (also tried different USB ports). And as you can see in the pictures my USB Stick runs fast. Same Port on the PC.
    I really have no idea what is going on. The next time I will buy some super extrem fast cards for mor emoney.

    I really want to know what speeds other users get while tranfering files form an SD Card.
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