I just got the new hard drive and I was planning to copy files on my macbook. However when I was about to copy files on, it says that “elements cannot be modified”. Now i searched around and saw that I had to use disk utilities etc. in order to fix it, but when I try to use disk utilities “erase” tab, it does not give me the option to press “erase” nor change the format etc - it’s all grey/darken out. I am getting really frustrated and can’t seem to find the answer anywhere! Please help. Thanks!