I bought a Verbatim USB3 512Gb hard drive to ease the transfer from PC to Mac, and to use as a backup once the transfer was complete. Now I have everything on the Mac, I've discovered that the Mac can't write to the drive. Looking at the formatting options, the one that will be compatible with Windows (FAT32) has a maximum file size of 4Gb. I'm not sure if I have any files larger than that. If I do, what will happen to them during a backup? Is there a way around this? I would like to keep PC compatibility, so that I can give people copies of my photos, etc from the external drive.