Unknown Computer Cleanup
If you have enabled unknown computer support, ConfigMgr creates a new Unknown resource each time an unknown computer boots using PXE or boot media. This Unknown resource is essentially a placeholder for that unknown computer. It is eventually converted into a normal system resource once the task sequence progresses far enough for the ConfigMgr client agent to be installed (during the Setup Windows and ConfigMgr task), at which point it becomes fully functional. If anything prevents the task sequence from getting to or successfully finishing this task, the unknown resource is abandoned and left to clutter up the Devices node and the All Systems collection, plus any other collections that might include it based on membership ...
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