SD card reader has only USB 2.0 speed

[Andrew W]

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!

[Andras Kenez]

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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[Thom]

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.

[Andras Kenez]

Chinase engineers always make mistake….

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

[Author]

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