How Can I list Directories in a Disk using Terminal Command

It would be most helpful if you would post two things:

• Screenshot of your Disk Utility readout, especially the left panel. Make sure you select View > Show All Devices before doing this. AND expand ALL disclosure arrows.
• Copy of the results from doing "diskutil list" in Terminal

Those "disk7" numbers are low-level devices. You can't get any meaningful data out of them.

You can run "diskutil lists" in the Terminal to see the association between mounted volumes and individual devices.

mount

The mount command with no arguments will list the mounted file systems. For example

/dev/disk5s1 on /Volumes/Samsung_SSD_1TB (apfs, local, nodev, nosuid, journaled)

With the device shown first, then the mount point followed by various mount options.

It is also possible to mount disk images, such as .dmg files, such as open Karabiner-Elements-14.12.0.dmg

/dev/disk10s1 on /Volumes/Karabiner-Elements-14.12.0 (hfs, local, nodev, nosuid, read-only, noowners, quarantine, mounted by raharris)

It's hard to say. Maybe a screen shot would be helpful?

Normally Disk Utility will list all devices, including disk images in the sidebar. File systems can be complicated, so you may have to use the little disclosure arrows to see which disk image contains the "Malcom" volume.

And for all know, this could be a network volume. In that case, it won't appear in Disk Utility.

You can also use the command line tool "mount" to see which devices are associated with which mount points. This command will show all mount points, regardless of physical media.

Another way to get a list of all files and folders on a drive is to get the free version of BBEdit, open a new window and drag the drive into the window.

find “/Volumes/name-of-volume” -type d