[kwlug-disc] Speed of microSD card?

[William Park]

I'm trying to make BeagleBone Black 
<https://www.beagleboard.org/boards/beaglebone-black> into a 
programmable keyboard (and mouse, hopefully).  It has one "USB device" 
port (mini-USB) and one more common "USB host" port (USB-A).  It boots 
off microSD or eMMC.  One frustration is slow speed of my SD cards.  I 
have lots of them, 8-16GB and 5MB/s. Too slow to flash images, and too 
slow to run on it.

So, I've been shopping around for a *fast* microSD card.  What I don't 
understand is,
     - some U1 cards are faster than U3 cards.  This means, I can't just 
search for "U3" cards.

- Do you know why U3 cards are slower than U1 cards?
- Any brand recommendation?
     - Canada Computer has lots of "Teamgroup".  Are they good?  They 
are new (to me).
     - Of course, can't go wrong with Samsung.  But, not at $20 range.
     - no Kingston.  All the dead cards were from Kingston.
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