Why are there no true cross-platform filesystems?

As someone that has recently installed multiple operating systems on my desktop, I find a major problem that I think shouldn’t really exist, but does. Over the last few months I have made it so that my PC desktop runs Windows 8, Linux Mint 14, and OSX Mountain Lion. This was a long endeavor, especially OSX. But everything works nicely and I have the development environments I need on all 3 platforms and all the additional chat, social, and browsing software I like to have running. Read more