Pine64 storage

[baylf2000]

answer me proof sd card speed !  Please !

Nice, you seem to be the average Pine64 kickstarter backer trusting in specs and promises more than in reality 

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Getting anything greater than about 25MB/s from an SD card

I would suspect it's more close to 20/22MB/s (write/read) as with any other Allwinner SoC now.

Exactly. But it's not just Allwinner. The SD card specs say clearly that the maximum theoretical speed for the SD bus itself is 25MB/s. The only way to improve on that is to upgrade the bus to UHS, which requires specialised voltages in the case of UHS I, and extra data lines in the case of UHS II.

I have never seen an ARM soc board implement a UHS interface. I have no idea why. I wish I knew. It's not rocket science. I'm not it might be because of licensing costs for UHS interfaces, but no manufacturer has ever confirmed this to me.

For our rude Chinese friend, here is the official interface specs from the SD Association themselves. https://www.sdcard.org/developers/overvi...index.html

Can you Stop ?

I have no time to here read your English .  This is over 25MB/s , you asked is SD 2.0 version




Please read allwinner A64 document 

https://drive.google.com/file/d/0B0cEs0l...ef=2&pli=1

Why are you so RUDE? WHO ARE YOU?? If you have no time to read English, why are you here??? You obviously have no idea what you're talking about, so GET LOST!

You are also VERY WRONG. You are confusing the bus interface with the protocol. Two completely different things.

Yes, the processor claims to support UHC, yet there is only a single mention of it in the entire 700+ page "user manual", so I doubt whether it's true. And even if it were true, it requires special implementation both electrically on the board, and within the drivers/firmware. Unless the creators have specifically written a UHS driver, then it WILL NOT WORK AS A UHC interface, and therefore, IT WILL BE LIMITED TO A MAXIMUM OF 25MB/s.