iPhone 18 Pro Max storage can drop lower than a hard drive at 1.1 MB/s during heavy writes
- ID
- 26954
- Status
- summarized
- Published
- 22 Sep 2026, 1:34 AM
- Fetched
- 22 Sep 2026, 10:32 PM
- Provider
- Tom's Hardware
- Category
- technology
- Original URL
- https://www.tomshardware.com/pc-components/ssds/iphone-18-pro-max-storage-can-drop-lower-than-a-hard-drive-at-1-1-mb-s-during-heavy-writes-qlc-nand-offers-higher-capacity-but-reportedly-suffers-38-percent-drop-compared-to-tlc-based-pro
- Source URL
- https://www.tomshardware.com/feeds/all
Summary
- Score
- 4.0
- Created
- 22 Sep 2026, 10:38 PM
- Tags
- Audience
- developersvibe_coders
What happened
The iPhone 18 Pro Max reportedly sees storage write speeds plummet to 1.1 MB/s under heavy write loads due to QLC NAND, a 38% drop compared to TLC-based Pro models. QLC enables higher capacity but degrades sharply when the SLC cache is exhausted.
Why it matters
If you build iOS apps that write large files or batch data locally (video processing, on-device ML model caching, offline-first sync), test under sustained write scenarios rather than short bursts — QLC throttling could make your app feel unresponsive on the newest flagship device.
Discussion angle
Whether on-device caching strategies for mobile apps need to account for QLC throttling, or if this is a niche edge case that almost no real-world app will hit.