micro SD speed

[stephen fleming]

I was reading that the new Odroid C2 has a micro SD clock of 83MHz and a bus speed of SDR50 (up to 50 MB/s), and that the Raspberry Pi has a micro SD clock of 50MHz and a bus speed of SDR25 (up to 25MB/s). What is the micro SD clock and bus speed of the Pine 64?

[tllim]

I was reading that the new Odroid C2 has a micro SD clock of 83MHz and a bus speed of SDR50 (up to 50 MB/s), and that the Raspberry Pi has a micro SD clock of 50MHz and a bus speed of SDR25 (up to 25MB/s). What is the micro SD clock and bus speed of the Pine 64?

I thinks the SDR25 should be a correct one, even to Odroid C2. The Pine A64's SoC can perform SDR50 but I don't think micro SD which operate at 3.3volt can perform on such speed. I will be glad to prove wrong.

[stephen fleming]

According to a test they did, the Odroid C2 did 36.7 MB/s for UHS-1 read and 15.5 MB/s for UHS-1 write.

[KryPtAlIvIaN]

Not sure if this pertains to the conversation, but I was able to transfer a Dreamcast ISO from a Flash drive to the Pine through a USB Hub at 19-29MB/s.

[stephen fleming]

Not sure if this pertains to the conversation, but I was able to transfer a Dreamcast ISO from a Flash drive to the Pine through a USB Hub at 19-29MB/s.

Unfortunately no, the SD interface is not the same as the USB. I do not have my Pine 64 yet, so I can not do any testing myself. However, if you are running Linux here are the commands the people a Hard Kernel used to do the test on the Odroid C2:

Code:

   Write command
   dd if=/dev/zero of=test oflag=direct bs=8M count=64
   Read command
   dd if=test of=/dev/null iflag=direct bs=8M

Depending on how fast you micro SD card is, that can also effect the results.

[joe]

Not sure if this pertains to the conversation, but I was able to transfer a Dreamcast ISO from a Flash drive to the Pine through a USB Hub at 19-29MB/s.

Unfortunately no, the SD interface is not the same as the USB. I do not have my Pine 64 yet, so I can not do any testing myself. However, if you are running Linux here are the commands the people a Hard Kernel used to do the test on the Odroid C2:

Code:

   Write command
   dd if=/dev/zero of=test oflag=direct bs=8M count=64
   Read command
   dd if=test of=/dev/null iflag=direct bs=8M

Depending on how fast you micro SD card is, that can also effect the results.

I don't talk anymore , but you topic is this  price $40 Odroid C2 2G to compare $29 pine64 2G i saw is not fair.
if Odroid C2 the price is $29 , i think is fair to compare .

and pine64 have 1G , 2G choose , but Odroid C2 have not , and for me is basic user only 1G $19 enough

[Danton]

Any updates?

I'm looking at different micro SD's and would like to know which one to buy (C10 / U1 / U3).

[Ghost]

Any updates?

I'm looking at different micro SD's and would like to know which one to buy (C10 / U1 / U3).

Class 10. UHS performance brings no benefits for the Pine (this was discussed in another thread, I'll try and find it).

Yup, it was here.

[Danton]

Thanks for your answer!

[janjwerner]

jjwerner@localhost:~$ dd if=/dev/zero of=test oflag=direct bs=8M count=64
dd if=/dev/zero of=test oflag=direct bs=8M count=6464+0 records in
536870912 bytes (537 MB, 512 MiB) copied, 24.029 s, 22.3 MB/s
jjwerner@localhost:~$ dd if=/dev/zero of=test oflag=direct bs=8M count=64
536870912 bytes (537 MB, 512 MiB) copied, 24.0569 s, 22.3 MB/s

Sandisk Extreme 32GB U1 micro SD card