Quote Originally Posted by JKTrix View Post
I only have 2 'installed' BluRay games on my PS3, and that's VF5 and Ninja Gaiden. Upon downloading the MGS4 trailer this morning, I noticed I had 39 GBs of free space left. I was surprised that so much of my 60 GB harddrive space had been eaten by 2 games.

Not to say the 2 games alone took up 21 GBs. Boring details in spoilers. Skip past for the result.

This is mostly anecdotal evidence, as I don't have my PS3 here to check the real numbers.
I only own 2 other games, Resistance and Gundam Musou, and those read off the disc. I have 4 demos installed (Genji, Armored Core, Ninja Gaiden, Rub a dub) and one HD video of around 250 megs. Above all that, I have 3 full PS2 cards installed on my drive. Assuming the demos are 1GB each (they are not), all of the other data that I loaded myself should only be 4.5 GB. Add to that around 2 GBs of system data and updates, and that's 6.5 GBs of data used for stuff that is not installed games.

60GBs (PS3 max storage) minus 6.5 GBs (other data) = 53.5 GBs remaining space.

So if my current 'remaining disk space' after installing 2 games is 39 GBs:

53.5 GBs - 39 GBs = 14.5 GBs.

Those two installed games together equal at least 14.5 GBs.
You're forgetting that 5GB is automatically allocated to the PS3's operating system, so the total is actually about 55GB. Also, although I don't have Ninja Gaiden, going by Croyles comment that it take up about 4GB means that between that and VF5, they're only taking up about 6-7GB (VF's install is roughly 2-2.5GB). Resistance also has a 160MB (give or take) install, though that isn't substantial. I don't know how large the MGS4 trailer is since I haven't been able to log into the Playstation Network lately (it's a problem resulting from the 1.80 firmware I haven't bothered trying to fix yet), but unless it's a few GB you likely have some larger files on the PS3 than you realize. I have several trailers, CD's, the Gran Turismo demo, and several game installs/save files (more than you list) and I've hit the point where I have 39GB left.

The beauty of the system though is that, as Croyles said, you can always back stuff up, or just delete older installs you aren't using to make room for new games, or if you want, you can always replace the HDD with a bigger one.