Failed to mount USB drive (Samsung 4TB) - how to fix this?

[gold_finger]

It's likely file system is currently owned by root, therefore you can't write to it.


Plug in external drive, let it auto-mount, then close window.


Open a terminal and enter this command to find out what its mount point is:

Code:

lsblk -af

It will likely be something like "/media/4tb-drive", or "/media/username/4tb-drive".  Substitute your mount point exactly as displayed by command above in place of my generic "/media/4tb-drive" and your actual username in place of "username" to set ownership to yourself instead of root.

Code:

sudo chown -R username: /media/4tb-drive

Now open drive again and you should be able to write to it.