Verb
unmount (third-person singular simple present unmounts, present participle unmounting, simple past and past participle unmounted)
(computing, transitive) To reverse a mount operation; to instruct the operating system that the file system should be disassociated from its mount point, making it no longer accessible.
If this happens, detachment can be delayed indefinitely until you unmount the volume, force detachment, reboot the instance, or all three. Source: Internet
In addition, you could have the HMR unmount and mount a new container. Source: Internet
This lesson covers how to mount and unmount file systems and how to work with quotas. Source: Internet