Boot mount with root privileges

I wanted to know how to be able to write files or modify them on a another disk when i boot in so I don’t have to use dolphin as root every time I need to write the disk
Thanks in advance

Post result of

fdisk -l

and

cat /etc/fstab

This will probably help if you already know where I am going
FSTAB - Editing Manually - openSUSE Forums

worked…Thanks