Chromebook OS and WD external drives

I have several WD drives that have been used with my Mac for backing up files + storage. I now have a new Chromebook and want to access some of those old files. I have connected one of the drives and it displays as a new device BUT I cannot access the files. Do I need to install a WD driver in order to use the WD drives? If so, do they work with the Chromebook OS?