The device will be mounted with a safe set of default options. You can influence the options passed to the mount(8) command with --options. Note that only safe options are allowed - requests with inherently unsafe options such as suid or dev that would allow the caller to gain additional privileges, are rejected.
Note that as some physical devices contain multiple drives (for example 4-in-1 flash card reader USB devices) powering off one drive may affect other drives. As such there are not a lot of guarantees associated with performing this action. Usually the effect is that the drive disappears as if it was unplugged.
The option --no-user-interaction can be used to request that no interaction (such as the user being presented with an authentication dialog) must occur when checking with polkit(8) whether the caller is authorized to perform the requested action.
This program does not assume that the caller is the super user - it is intended to be used by unprivileged users and authorizations are checked by the udisks daemon using polkit(8). Additionally, this program is not intended to be used by scripts or other programs - options/commands may change in incompatible ways in the future even in maintenance releases. See the "API STABILITY" section of udisks(8) for more information.
udisksctl ships with a bash completion script to complete commands, objects, block devices and some options.
Written by David Zeuthen <firstname.lastname@example.org> with a lot of help from many others.
Please send bug reports to either the distribution bug tracker or the upstream bug tracker at m[blue]http://bugs.freedesktop.org/enter_bug.cgi?product=udisksm.
udisks(8), udisksd(8), umount.udisks2(8), polkit(8)