None in DF

None is a mount point without a specific partition. In fact, some special Russian files are mounted. The details are as follows: udev->/Dev is the system's device file. The hardware device found at startup is stored as a file here. Each device file records the attributes, status, drivers, and other information of a hardware. None->/dev/SHM is the virtual memory of the system. Cache in windows. None->/var/run: RunningProgram. None->/var/lock does not know what to do, but it can be confirmed that if the lock file corresponding to a program exists here, this program may not be opened, for example, amule.