Running in always fresh (AF) mode, it is quite clear. For my umble system:
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guest@porteus:~$ df -h .
Filesystem Size Used Avail Use% Mounted on
aufs 220M 26M 194M 12% /
have 220M of 'disk space' for the live system. Get a warning of low disk space once under 200M like now. So if add to /tmp or install a package mostly going into /usr, the disk space will be further reduced. So can look at it in that I have a hard disk of 220M capacity which is 12% filled. Therefore do not normally install packages, but instead activating modules, the implementation of which takes up a non-significant amount of 'disk space'.
Another story if saving changes continuously. Tried this with a a '100G' save.dat file, and was informed by df
that I had 100G of 'disk space', as given under Filesystem Size.
Linux porteus 4.4.0-porteus #3 SMP PREEMPT Sat Jan 23 07:01:55 UTC 2016 i686 AMD Sempron(tm) 140 Processor AuthenticAMD GNU/Linux
NVIDIA Corporation C61 [GeForce 6150SE nForce 430] (rev a2) MemTotal: 901760 kB MemFree: 66752 kB