A normal live USB forgets everything the moment you shut it down. Rufus's persistent partition option fixes exactly that - your files, settings and installed programs survive the reboot. Here is how it works and where its limits honestly lie.
Persistence is the difference between trying Linux and using it from a pocket drive. The setting appears only when Rufus recognises the distribution, it costs you nothing but spare capacity on the stick, and the one decision that matters - ISO mode versus DD mode - is explained before you ever press Start.
Select a Linux ISO and, for the distributions Rufus knows how to handle, a Persistent partition size slider appears in place of the Windows options. It mainly covers the Debian and Ubuntu family and their derivatives - Rufus 4.10, for example, specifically improved persistence support for Linux Mint. If the slider never appears for your ISO, Rufus does not support persistence for that distribution, and forcing it with forum tricks usually breaks booting.
A plain live USB is amnesiac: files you save, settings you change and programs you install all vanish at shutdown. With a persistent partition, Rufus reserves part of the stick as a storage area the live system writes to - so your documents, Wi-Fi passwords, browser data and installed packages are still there after a reboot. It turns a demo disc into a pocket work environment.
The ISO's own files take the first slice of the stick; the slider divides much of what remains. Give persistence at least a few gigabytes - system updates and a handful of applications eat space faster than people expect, and a full persistent area makes the live system complain and misbehave. On a 32 GB stick, being generous here costs you nothing you were using.
For many Linux images Rufus asks how to write:
After the first boot, save a small test file on the desktop, reboot from the stick, and confirm the file survived. Thirty seconds of proof beats discovering the truth after an afternoon of work. Only then start treating the stick as your portable system.
The video's Rufus walkthrough covers the creation flow that Linux images use as well - watch the options appear in real time.
▶️ Watch Full VideoBecause Rufus supports persistence only for distributions it knows - chiefly the Debian and Ubuntu family and close derivatives. For other images there is no slider and no supported way to add one in Rufus; the live system will simply forget everything at shutdown, as live systems do.
Partly. In ISO mode the main data partition is formatted so Windows can read it, and files there are visible normally. The persistent area itself uses a Linux file system that Windows does not show without extra tools - which is expected, since only the live system needs it.
Sadly, yes - it is the known weak point of live persistence. Kernel and bootloader updates inside a live environment can break its boot chain. Recover your files by reading the persistent area from another Linux system, and treat persistent sticks as convenience tools rather than systems you upgrade forever.