3.13.0 - Out of Hard Drive Space - Show Init Failure

Hi,
I have hit this issue repeatedly over the past few years, so hopefully we can now get to the bottom of it, as its happing to my main console.

RoadHog4 - 3.13.0 Clean Installed (on release).
18 Showfiles
33 backups

If I try to expand a show file from any of the backups I get "SHOW INIT FAILURE"
PIG OPEN BACKSPACE cannot save the day.
Hard reset is the only option (or wait for Server Loading to finish).
If I try again to expand a show file from backup I get "FAILED TO MAKE DIRECTORY......"

So... the solution is to delete some shooflies... then I can expand fine...
.. which means I am out of Hard Drive space...
.. and that shouldn't be the case for so few files on the drive.

What tools can I use to see what is taking up the HD space? as when I have reported this in the past, developers have said that I shouldn't be out of HD space.
PIG OPEN 5 gets me to the file browser.... but I can't see any size values.

Thoughts?

PS.... I deleted 5 shows so I could continue touring.... and then re-expanded 4 shows.. and hit the same issue... so the state is not "cleaned" by any power cycling or Log On - Log Off actions..... you have a copy of the show file I sent a couple of weeks ago.