micro SD speed
#1
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?
  Reply
#2
(02-08-2016, 05:30 PM)stephen fleming Wrote: 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.
  Reply
#3
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.
  Reply
#4
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.
  Reply
#5
(02-09-2016, 12:12 PM)KryPtAlIvIaN Wrote: 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.
  Reply
#6
(02-09-2016, 02:09 PM)stephen fleming Wrote:
(02-09-2016, 12:12 PM)KryPtAlIvIaN Wrote: 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
  Reply
#7
Any updates?

I'm looking at different micro SD's and would like to know which one to buy (C10 / U1 / U3).
  Reply
#8
(03-12-2016, 08:31 AM)Danton Wrote: 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.
  Reply
#9
Thanks for your answer!
  Reply
#10
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
  Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
  High speed I/O richw42 3 2,856 01-15-2017, 04:08 PM
Last Post: richw42

Forum Jump:


Users browsing this thread: 1 Guest(s)