lash

Am trying to follow the recipe for creating a hidden volume, but can't create the filesystem. I understand the warning that for inexperienced users it's "nearly impossible" to get the sizing of the volumes right. However, I can't see any description anywhere of what is concealed behind this near impossibility. At the least, I would have expected an attempt to create an fs with size considerably smaller than the presumably allocated size to succeed. My feeble attempt follows below. Any pointers would...