It is a pity but some of the descriptions needed are lost with the server disk failure of this forum.
But this at least one is still there (partly) http://www.weather-watch.com/smf/index.php?topic=59102.0
The solution is to boot from the SD card and then have an USB disk to proceed.
If you would use a ram disk, i think all changed settings (totals) would be lost at a reboot as there is no “folder/directory” structure to put some of the things in a ram disk and all others on the SD card.
I am running consoleWD for multiple years from an SD cardand still with the same first quality card.
But that was a normal SD card, not a micro one.
Wim