[kwlug-disc] Speed of microSD card?

[Doug Moen]

If you feel like sharing more information about your programmable keyboard and mouse, I would be interested.

On Sun, Nov 2, 2025, at 8:02 AM, William Park via kwlug-disc wrote:
> 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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