Exceptions to the 20 gig space requirements(in other words, I found a reason for you to want a lot of space on your Mint drive)
STEAM !!!
Steam has begun to shift the good old games over to Linux, the ones I played and LIKED back in the day, and their many many successors.
Examples, Alice and Alice the Madness Returns and Longest Journey and Siberia and Siberia 2 (each of them for $2.99 each on sale)
Now, I am not normally much of a gamer but I find as a budding old fart I have lots of time to kill and TV isn't cutting it, so I am gaming more than I used to.
GAMES TAKE UP A LOT OF ROOM, and even if you use the Steam trick of un-installing them when you aren't using them then re-installing them when you want them again, the fact you have more games lying around means you will use a lot more room on your Linux drive.
Each game is like 10-15 gigs .... occasionally a biggie takes 20 gigs all by itself.
Steam makes gaming sooooo easy -- you can log into your account on multiple machines and keep some windows games over there on the wife's machine and keep your Linux games on your own machine.
Sneaky, huh? Move your headphones and mouse over to her machine and do Siberia while she sleeps .....
She may wonder why you left a different mouse on her machine, that's because you game better with your best mouse type and a roller ball trackball mouse isn't always optimal for fast first person shooter work. A regular optical "jest move it" mouse works better sometimes.
Note: if you prefer to do your gaming on Windows on your old partitions, leave enough room there for your game collection to expand.
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Fair Warning about the Longest Journey and the Siberia games, the French/Russian sense of a "walk around and find/do things" game is
extremely convoluted -- you will need a walk through to help you make progress, or else you will go crazy.
23 pages of complex puzzles that with the walk through are still tough to do. French/Russians are a complex people and even their modern mythology is feature rich -- and you sense that they have a sense of lasting pride in Russia, no matter if Czarist or Communist at the moment.
Even the rusting ruins of a steam punk Communism are kinda impressive and sad ....