Dev
The /dev folder is a core macOS directory that contains device files used by the system and command-line tools to communicate with hardware and virtual devices.
What is Dev?
The /dev folder is part of macOS and stores special device files rather than ordinary documents or app data. These entries let the operating system, drivers, and command-line tools interact with hardware components and virtual interfaces such as disks, terminals, audio devices, and pseudo-devices. Advanced users may encounter /dev when working in Terminal, using disk tools, creating bootable media, inspecting storage devices, or troubleshooting low-level system behavior. Many entries in this folder are created and managed dynamically by the system, and their contents are tied to core Unix and macOS functionality rather than to a single app. This is a system-level part of the operating environment, not a user cache or removable leftover folder.
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Safety overview
Status: Use with caution
This is a protected system directory used by macOS itself. Files in /dev are device nodes, and changing or deleting them can interfere with disks, terminals, installers, and other low-level system functions. Even if some names look temporary or unfamiliar, they are not normal junk files. Treat this folder as system-managed and avoid modifying it unless you are following trusted, expert-level instructions for a specific maintenance task.
Recommendation: Keep /dev in place and do not try to clean it manually. If you were investigating disk space or system clutter, look instead at user caches, logs, downloads, or unused app data, because removing items from /dev can cause system tools and hardware access to stop working correctly.
File path
/dev
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