At the terminal, go to the directory that contains the mount point for the disk (so if the mount point is /mnt/disk go to /mnt.

Run ls -l. This should list everything in /mnt with the owners and permissions. If your mount point (in this example disk) is owned by user and group root, then you just need to change ownership of the mount point and the disk attached.

With the disk attached, run sudo chown -R user:user disk

Replace each instance ofuser with your system username (if you’re not sure what you’re username is run whoami and it will tell you), and replace disk with your mount point directory.

Here’s what this does:

• sudo: escalates your privileges to run the chown command
• chown: the utility that allows you to change ownership of files and directories
• -R: tells chown to change ownership recursively
• user:user specifies the user and group that will own the files/directories you are modifying.
• disk: specifies the file(s)/directories you want to change ownership for.