TechTablets › Forums › Cube Forums › Cube iWork10 Ultimate › SD card reader has only USB 2.0 speed
Tagged: Sdcard reader, Slow USB, USB 2.0
- This topic has 4 replies, 3 voices, and was last updated 7 years, 9 months ago by Andras Kenez.
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June 12, 2016 at 1:18 pm #40680
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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You must be logged in to view attached files.June 13, 2016 at 8:15 am #40754Really 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!
June 13, 2016 at 5:20 pm #40840Thank 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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You must be logged in to view attached files.June 13, 2016 at 6:57 pm #40848Fairly 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.June 14, 2016 at 7:13 pm #40989Chinase 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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