By default, only the root user and users with superuser privileges are allowed to mount file systems and devices in FreeBSD. However, you can allow normal users to mount CD-ROMs, DVDs, and USB devices by modifying the /etc/devfs.conf file.
To allow normal users to mount CD-ROMs and DVDs, add the following lines to the /etc/devfs.conf file:
perm cd0 0660 perm cd1 0660
This will give normal users read and write permissions for the CD-ROM and DVD drives, which will allow them to mount and unmount these devices.
To allow normal users to mount USB devices, add the following lines to the /etc/devfs.conf file:
perm ugen* 0660
This will give normal users read and write permissions for all USB devices, which will allow them to mount and unmount these devices.
It's important to note that giving normal users the ability to mount and unmount file systems and devices can potentially be a security risk. Use caution when allowing normal users to mount file systems and devices, and consider the security implications of your decision.
After making changes to the /etc/devfs.conf file, you will need to restart the devfs daemon for the changes to take effect. You can do this by running the following command:
/etc/rc.d/devfs restart
This will restart the devfs daemon and apply the changes that you made to the /etc/devfs.conf file.