It's fine to install and run the Ravencoin binaries on the microSD card, but for optimal speed and expanadabiltiy you should use the SATA SSD as the data storage location for the blockchain and everything else. I recommend creating a directory on the SSD called "/Ravencoin/RavencoinData" and then reference it as follows.
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To START the node:
<pre>./ravend -daemon --datadir=/media/pi/SSD/Ravencoin/RavencoinData</pre>