Hot-pluggable devices, such as USB devices, will probably have to be reconnected for the new rules to take effect, or at least unloading and reloading the ohci-hcd and ehci-hcd kernel modules and thereby reloading all USB drivers.
If rules fail to reload automatically: to see if anything is actually happening.
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A rule to match, can be composed by the attributes of the device and the attributes from one single parent device.
looking at parent device '/devices/pci00/00.1/usb3/3-2': KERNELS=="3-2" SUBSYSTEMS=="usb" ... ATTRS=="Omni Vision Technologies, Inc." ATTRS=="unknown" ATTRS=="4519" ATTRS=="00" ATTRS=="USB Camera" ... However, if you intend to write a rule to do something when a device is being removed, be aware that device attributes may not be accessible.
udev loads kernel modules by utilizing coding parallelism to provide a potential performance advantage versus loading these modules serially. The inherent disadvantage of this method is that udev does not always load modules in the same order on each boot.
If the machine has multiple block devices, this may manifest itself in the form of device nodes changing designations randomly.
In this case, you will have to work with preset device environment variables.
To monitor those environment variables, execute the following command while unplugging your device: This will not perform all actions in your new rules but it will however process symlink rules on existing devices which might come in handy if you are unable to load them otherwise.