True, my response was for installing on ClearOS 6.x - should have made that clear... ClearOS 7.3 added support for embedded MMC (eMMC) interface version 5.0 - so should be better as you indicated... eMMC is really like an internal MMC card that is not pluggable - would be wise if you use it to take steps to minimise the number of writes. The eMMC flash memory controller isn't as sophisticated as the controller in SSDs. Hence cell wear levelling, block sparing, TRIM etc. are not to quite the same standard. Still, for a firewall it should be quite sufficient. Would think twice about using an eMMC based system for a busy mail server, web proxy etc and in-fact anything that causes prolific writes... Also install enough memory to minimises swap activity. If you plan on a lot of writes, you might want to consider installing an decent SDXC card and use that for swap, partitions having high write activity etc, back it up regularly. Then if it fails, just insert another and restore. Looks like an interesting box...

and why the concern about writes - an example. The warranty on my Samsung 840 Pro 128.0 GB SDD states "Workloads in excess of 40 GB/day are not covered under warranty" - my busy office server exceeds that on average (46.7 GB/day) - so it wasn't covered from almost the moment I started using it Hopefully your little box will have a much easier life...