About Disk space
Jamroom Hosting
Hi
Unlike 'shared' hosting, that most other companies offer, where you are allocated a proportion of the total server disk space, with Jamroom Hosting you get a dedicated VPS just for your domain(s) that needs to run its own Linux operation system for the Apache and MySql hosting applications etc. This is what is taking about 1GB of the server disk space. The slight variants of that you are seeing is that operating system doing its thing and using disk space for itself, as required (just as your PC does).
We are rolling out very soon another Hosting Control Panel feature whereby you can see the actual additional disk space each of your domains is using.
hth