Nintendo of America’s support page has revealed that the Nintendo Switch cartridge for NBA 2K18 requires a 16GB download for all the features included. Interestingly, 5GB of space is reserved for save files. You can read the full breakdown, below:
A microSD card (sold separately) is required to download NBA 2K18 for Nintendo Switch, in addition to 5GB per save file on the system memory. Please have the microSD card inserted before beginning the game download and ensure that you have a least 5GB of system memory (not on a microSD card) available.
Below are the storage space requirements:
Initial software download after purchase – 6.8 GB
Additional software update – 16.1 GB
Save file – 5 GB system memory per save file
Please note that a microSD card is required for both the digital and physical versions of the game. Additional information about this requirement is located on the game packaging and in the Nintendo eShop / Game Store.