So most Sheevans use an SD card or an external USB drive to run the OS from to prevent the NAND from wearing out too quickly.
Is this true? Got a source for this info? I run from internal NAND, as that is clearly what it's designed for. If it does mean "wearing out" the internal memory, I would like to know about it..
The plug comes by default with JFFS2 and can be replaced using installer alpha-6 with ubifs.
Both those filesystems makes sure to spread the writes over the whole NAND to make it wear our much less. BTW - the same technology is used in SD cards and external USB sticks.