So, I used my Seagate for as a vault to hold backup data for my PC. I tried to transfer it to my Macbook Pro. Fine... it did that, no problem. Then, a couple days later, I tried doing it again and all I got was a pop up window that read Disk Insertion with an exclamation point in an octagon sign right next to it. Then it read "The disk you inserted was not readable by this computer. It gave me three options... 1) Initialize 2) Ignore or 3) Eject. Now when I hook my Seagate up to my PC and try to open it, it only gives me an option to format it (erase it). What the heck?! I don't know what to do. If I would have known I could only hook up my Seagate ONCE - then I would have transferred everything I had on there when I had the chance. Frustrated and on the verge of a serious panic attack.