While installing the seagate backup plus on my mac originally, i was given two options I installed it, restarted my computer, and then I could drag and drop ( aka write). It was an installer for some 3rd party program which allows NTSF ( not suitable for work? no, its some kind of formatting ) devices to be read AND WRITTEN to on mac os. I just bought a seagate backup plus slim 1T drive, on 11/26/14.Īfter putzing about for over two hours, looking on this help forum and on others, i noticed on seagate's home page for my product a download link for 'NTFS driver for mac os'