SD card reader has only USB 2.0 speed

SD card reader has only USB 2.0 speed

TechTablets Forums Cube Forums Cube iWork10 Ultimate SD card reader has only USB 2.0 speed

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  • #40680
    Andras Kenez
    Participant
    • Posts: 35

    I tested my Work 10 TD with 2 type of 64GB SD card

    KINGSTON MICRO SDXC 80MB/s 64GB CLASS 10 G2 UHS-I U1

    http://www.ebay.com/itm/351675862627?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

    MIXZA TOHAOLL Ocean Series 64GB Micro SD Memory Card

    http://www.gearbest.com/memory-cards/pp_337822.html

    I tested booth card with my iWork 10 TD and my Onda Obook 10 V5

    Booth SD cards woks only USB 2.0 speed with iWork 10, and more faster USB 3.0 mode with Obook 10

    iWork read about 37-40Mbyte/s from SD cards

    Obook read about 52-64 Mbyte/s from SD cards

    USB view do not show connection with SD card reader, so I do not now how can I determine connection type, but the speed only USB 2.0, I1m sure. I measured same speeed with external USB devices in USB 2.0 mode.

     

    Put your test, Please

    And write If you have any idea improving SD card speed…

     

     

     

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    #40754
    Andrew W
    Participant
    • Posts: 95

    Really I’m not surprised.

    I mean you will never ever get real-world speeds that match proposed data-rates.

    I don’t care if it a a wireless network or a Hard-disk. They’re more theoretical and the SD bench marks seem to show it. USB 2.0 High Speed is 480 MegaBITs per second (divide by 8 for megabytes). BUT

    Due to bus access constraints, the effective throughput of the <i>High Speed</i> signaling rate is limited to 280 Mbit/s or 35 MB/s (wiki).

    Maybe some sort of class-action is needed in the USA but until then…

    *****

    Is the device ROOTED?

    If so install something like 3C Toolbox.

    Then adjust the SD Cache size under system manager.

    I found 768/1024 worked well under my tests. But this was on a completely different device. Probably a galaxy note 1.

     

    The IO Scheduler can make a difference too.

    Have a play. Lets see the results.

    Good Luck!

    #40840
    Andras Kenez
    Participant
    • Posts: 35

    Thank you your answer,

    I tested SD cards only with Windows 10. Onda Obook 10 with same Intel SOC works with USB 3.0 speed.

    My Adata 64GB much more faster with Onda Obook 10 (see attachment)

    I Work 10 and Chuwi Hi 8 pro  works only with 2.0 USB speed.

    (But Obook 10 has horrible/ueless internal Wifi: full metal house -> Faraday  cage law)

    It is strange, because iWork and Chuwi Hi8 Pro also have USB 3.0 controller. It should be faster.

    It’s fact average user will not recognize the speed difference.

     

     

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    #40848
    Thom
    Participant
    • Posts: 8

    Fairly certain it’s on an USB 2.0 bus, on these the speed you’re getting is normal.
    Like, I have an usb 2.0 micro sd to usb converter, I get very comparable results.

    #40989
    Andras Kenez
    Participant
    • Posts: 35

    Chinase engineers always make mistake….

    Tablet with USB 3.0 controller and connect SD reader to USB 2.00 port …… Very-very big mistake..

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