Handling low max edge-case better, human-readable debug output

[AndrewFarley]

Features

• Updating various debug output to be human-readable, since bytes is just really, really long with a lot of zeroes, not ideal or reasonably human parsable
• Catching an edge case where a user puts a max disk size of too small, and a disk can't scale up any more

Closes #3 ( thanks for finding & reporting this @GuillaumeOuint )