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UFS, or Universal Flash Storage, is a storage interface used in many phones. It connects the controller and flash storage that hold apps, photos and other files. UFS is separate from RAM: a phone can have plenty of RAM and still take time to install an app or copy a large video.
What the generation tells you
| Generation | How to interpret it |
|---|---|
| UFS 2.0 | An older UFS generation found in earlier devices; evaluate the actual phone and capacity |
| UFS 2.1 | An evolution of the 2.x family; not a guarantee that every 2.1 chip beats every 2.0 implementation |
| UFS 3.0 | A newer interface generation with greater transfer potential than 2.x |
| UFS 3.1 | Adds features including Write Booster and power-related improvements; implementation still matters |
Samsung‘s UFS 3.1 documentation describes its products and features. A published speed for one capacity is a product result, not the mandatory read or write speed of the entire UFS standard.
UFS 3.1 is no longer the newest family
Newer commercial products include UFS 4.0 and 4.1, as shown in Samsung’s storage lineup. Check the exact phone specification; a recent model name alone does not establish its storage generation.
Which workloads benefit?
Large file transfers and video writes emphasize sequential throughput. App startup and multitasking also depend on smaller random operations, processor performance and software. Faster storage cannot repair a poor network connection or make every app twice as fast.
Capacity, available space, temperature and controller design affect measured results. Compare the same storage capacity and benchmark conditions where possible, and leave space for updates and temporary files.
For the underlying technology, see how NAND flash works. When comparing devices, consider storage alongside the camera features that suit your budget, rather than buying on one speed number.