The maximum the PS5 supports
8TB is the largest capacity Sony validates for the M.2 slot. It is aimed at collectors who want every game installed permanently and never want to manage space again. Realistically that is far more than most players need, but if you treat your PS5 as a library that stays fully loaded, 8TB delivers it.
Expect a clear premium per terabyte at this tier. The table above shows live 8TB prices ranked by price per terabyte so you can judge whether the convenience is worth today's cost.
Heat and fit are the real concern at 8TB
8TB drives are almost always double-sided and run warmer under sustained load, so an effective low-profile heatsink is essential rather than optional. Avoid tall tower or fan coolers, which will not fit the bay, and keep the stack under 11.25mm. A drive sold specifically as PS5-compatible with a fitted heatsink is the safest choice here.