Plan console storage for games.
Console storage planning starts from usable capacity, not advertised capacity — a one-terabyte console typically exposes around 800 GB after the system partition. Subtracting saves, captures and apps leaves the games budget, and dividing by average install size gives how many titles genuinely fit. Modern AAA installs of 70 to 150 GB mean that number is smaller than most owners expect.
Space required
Space required = games kept x average install size + saves, captures and apps
Fit and shortfall
Games that fit = floor((usable storage - other data) / average install size); shortfall = space required - usable storage
The system software, recovery partition and cache take a fixed slice, and decimal-to-binary conversion accounts for the rest. Roughly twenty percent of the advertised figure is typical.
External USB drives are fine for storing and for playing older-generation titles, but current-generation games generally require the internal drive or a certified expansion card for their required read speeds.