QLC NAND

iPhone 18 Pro Max: 1TB and 2TB Models Use Slower QLC Flash
Testing indicates iPhone 18 Pro Max 1TB and 2TB use slower QLC flash than the cheaper 512GB model, with sustained writes collapsing to 1.1MB/s.

Testing indicates iPhone 18 Pro Max 1TB and 2TB use slower QLC flash than the cheaper 512GB model, with sustained writes collapsing to 1.1MB/s.