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SD cards - Capacity & Performance

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Post time 2015-5-7 15:39:40 | Show all posts |Read mode
Edited by gaara at 2015-5-7 14:02

Hi all,

After a try to use a SSD with sata interface, my system is not stable in Android. For any reasons, after 10~15 shutdown/start, the system can't restart properly.

So, I'm thinking to buy a good SD card. For my tests, I actually have a 8Gb Kingston card (class 10). But the performance is not here, even it's better than a class 4. (and I think Orange Pi don't works with a class 4)
I would like a 64Gb SD card, class 10 of course, but I thinks there's differents class 10.
So I have seen these models:
- Samsung 64Go SDXC UHS-I EVO Micro SD Classe 10 : Read 48 Mo/s, Write: 10 Mo/s
- SanDisk Ultra 64 Go Classe 10 UHS-I : Read 48 Mo/s, Write 15 Mo/s
- SanDisk Extreme PLUS 64 Go Classe 10 UHS-I U3: Read 80Mo/s, Write 50 Mo/s (link)


This last choice is the best I have found.


My question: Does the Orange Pi capable to take benefits of the UHS-I U3 performance (UHS bus) ?



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Post time 2015-5-7 19:22:09 | Show all posts
I am using a Lexar x633 card (this one: http://www.amazon.com/Lexar-High ... L633R/dp/B00IF4OC8Y)
I didn't do any benchmarking on the OPI side. (my PC writes at about 25 MB/s using the Lexar USB SDHC reader).
You can also reach me on freenode irc, channel #orangepi username eFfeM

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 Author| Post time 2015-5-7 20:20:49 | Show all posts
I have also asked this question on BPi forum, and the response (for BPi pro) is that the speed rate for writing is not up than 16Mo/s, due of a limitation of A20.
The comparaison RPi / BPi is here: http://www.mikronauts.com/review ... eview-first-look/6/
It could be interessant to see the same test for Orange, but I think it's the same.
Thanks for your link, I know now that Orange works with UHS-I/U3 cards.

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 Author| Post time 2015-5-8 20:49:34 | Show all posts
My 8Gb card is 19,4 MB/s (read). I have tested with dd, to copy the card on my SSD.
(the SATA works again!)
But I have chosen this card: SanDisk Extreme 64 Go Classe 10 UHS-I U3
No Lexar available in France, I don't know why.

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Post time 2015-5-9 05:02:15 | Show all posts
Are you sure your getting enough power to the ssd? I would use a 5v step down from 12v to directly power it. Dont let usb's do it.

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 Author| Post time 2015-5-9 06:39:52 | Show all posts
Edited by gaara at 2015-5-9 00:43

One point for you, maybe it's for this reason.
The problem is the % of  the rendement (I must convert 19V), and so, a lot of juice is lost in the air...For example this one: 80%
But I will look by this way, thanx

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 Author| Post time 2015-5-15 21:33:56 | Show all posts
After a try with the SanDisk Extreme 64 Go Classe 10 UHS-I U3, the result is almost the same than the SSD. Without the consomption !
So, it's a good investment for the Orange

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Post time 2015-6-4 23:27:19 | Show all posts
gaara replied at 2015-5-15 21:33
After a try with the SanDisk Extreme 64 Go Classe 10 UHS-I U3, the result is almost the same than th ...

What read/write speed are you getting with the microSD?

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 Author| Post time 2015-6-5 01:23:21 | Show all posts
Edited by gaara at 2015-6-4 19:32
What read/write speed are you getting with the microSD?

I get read 361 MB/s and write 12.08 MB/s with A1 SD Bench on AndroidEdit: 361 Mb/s is a little big in my sense but the application says that... I will try another app to verify

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Post time 2015-6-5 21:28:50 | Show all posts
gaara replied at 2015-6-5 01:23
I get read 361 MB/s and write 12.08 MB/s with A1 SD Bench on AndroidEdit: 361 Mb/s is a little big  ...

Thx. I'll let you know my results when I get the cards.
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