adjustable persistence size
Originally created by @numbat on #17394 (Redmine)
There could be at least 2 reasons to want to allow the user to chose the size:
- USB disks are getting huge, some people may want a 3rd (or more) partitions for other things
- A user reported having an issue with a 1TB. They received errors so they had to reduce the size of the remaining free space (#17393).
Related issues
- Related to #17393