Are you sure it takes up 84 GB on your machine? It should take up only 4.75 GB currently (and most of that are empty blocks + space reserved for unconfirmed so you can actually pack the blockchain to under few dozen MB in case you need to transfer it).
It's a bit nasty so much ~5GB needs to be reserved despite the very small small size of actual blocks, but I've never heard it would take up anywhere near 84 GB. Must be a race condition / loop jam if you can confirm that's the case. What files are there and what are their sizes?