iPhone 18 Pro 1TB and 2TB Use Slower QLC Storage

Apple's iPhone 18 Pro and Pro Max use slower QLC flash in 1TB and 2TB models, while 256GB and 512GB models use TLC. Tests show QLC sustained write speeds drop to 79.4MB/s, and 1.1MB/s at 60% storage used. The 1TB model is 38% slower in 4K random reads than the 512GB TLC model.