Memory card write speeds.
I just bought 6 new memory cards. All 64Gb. All SDXC. All microSD.
|write speed||cost in pounds||class / spec||make / model|
|8.8 MB/s||11.50p||UHS-1 / class 10||Kingston.|
|17.0 MB/s||14.98p||UHS-1 / class 10||SanDisk Ultra|
|20.0 MB/s||22.44p||UHS-3 / class 10||SanDisk Extreme|
So: the difference between kingston and SanDisk Ultra was worth paying for, (twice speed for 4 pounds more). But the Ultra -> Extreme wasn’t worth it.
These are write speeds (what solo does). I didn’t measure read speeds.
experiment setup: lsusb -t (shows speed of connection on USB devices).
used: dd if=somehting.iso of=/dev/sd? bs=4M ; sync
bs=4M speeds things up. the bigger the better. 40M is no better, though.
bs=512 drops performance to 3.9MB/s absent drops performance to 3.9MB/s (probably defaults to destn blk size)