The dev filesystem manages the name spaces of devices under the Solaris operating environment. The global zone's instance of the dev filesystem is mounted during boot on /dev.
A subdirectory under /dev may have unique operational semantics. Most of the common device names under /dev are created automatically by devfsadm(1M). Others, such as /dev/pts, are dynamic and reflect the operational state of the system. You can manually generate device names for newly attached hardware by invoking devfsadm(1M) or implicitly, by indirectly causing a lookup or readdir operation in the filesystem to occur. For example, you can discover a disk that was attached when the system was powered down (and generate a name for that device) by invoking format(1M)).
The global /dev instance cannot be unmounted.