That is the original game install size plus his own estimation for unknown entities (DLC and assets). This is not the official number from 2K. He just adds up the install space requirements of the each original (Xbox 360 or Xbox One) games themselves. Then adds a little more for all additional original game DLC that is also included. And finally seems to assume several more GB for the upgraded assets. That is how he came to 70GB. The official install size could be a lot less or even more. Who knows!
The numbers he used are 16.5GB for BioShock (X360), 16.7GB for BioShock 2 (X360), 36GB for BioShock: Infinite (XOne)
That's alot...
I still have 2.5 TB free. Bring it on! Gotta love External HDD
glad I just bought the 2 tb xbox one s
Better look good
That is ridiculously large.