Now hook up Both Drives and Move any Mac Files from the NTFS Drive to the new drive just formatted. Now before you attempt to use the drive, open Disk Utilities and format for Mac OS try to format so it is capable of install Mac Operating system I believe it is called GUID (?) - if you have USB3 USB 2 just Format it for Mac Format. If your computer uses a USB3 connection, you will have reasonable read/write speeds. A mechanical hard drive at least 500 GB or 1 TB you can pick up fo $100 or less. My suggestion is depending on whether your computer uses a USB2 or USB 3 Connection. And I am not sure at the time NTFS was even allowed. If my memory serves me correctly, it had to be at least FAT32. Although Apple used to claim that you could read and write to any Drive whether formatted for Mac or PC, there were onlyĬertain types of PC formats it would accept. You are using a Drive formatted for Windows on a Mac. (I hope you don't have many files on this Drive).