Posted 26 April 2012 - 09:35 PM
Updates should be fine, at least to a point.
Whatever is the installed base is fixed in size. Anything you add or change will go into the persistent storage area. As long as the updates aren't too large or the storage area too small, everything should work OK. But continuing updates end up taking up a lot of room over time.
The first set of updates will go exclusively into the persistent area of the drive. There's no way around that. Subesequent ones will replace those as they happen.
You didn't say what you installed, so I don't know if this will apply. But if the version you installed uses apt/Synaptic, I'd pull up Synaptic, open Settings -> Preferences, choose the Files tab and select Delete downloaded packages after installation. That should minimize space needed for storage of updates.
I'd also go through everything that's installed and uninstall whatever I really didn't need. As I said, those packages will never be removed from the base filesystem. But your persistent area will identify them as not being available. That way they won't get updates that take up space.