micro SD speed
#11
(03-14-2016, 12:28 PM)janjwerner Wrote: 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

Good card, glad to know that read speed can achieve 22.3MB/sec.
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#12
(03-15-2016, 08:40 AM)tllim Wrote:
(03-14-2016, 12:28 PM)janjwerner Wrote: 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

Good card, glad to know that read speed can achieve 22.3MB/sec.

Should this micro sd read at least twice of the speed, shouldn't it?! Huh

Did i missed something?
Mr. T
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#13
(03-31-2016, 04:06 AM)Tassadar Wrote:
(03-15-2016, 08:40 AM)tllim Wrote:
(03-14-2016, 12:28 PM)janjwerner Wrote: 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

Good card, glad to know that read speed can achieve 22.3MB/sec.

Should this micro sd read at least twice of the speed, shouldn't it?! Huh

Did i missed something?

You can't exceed ~22MB/s sequential read/write speed on Pine64. But that doesn't matter that much since random I/O is way more important therefore you should choose a card that shines here. For some insights please read through this thread.
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