The Paragon Drivers allow you to use your Seagate drive with both Windows and Mac operating systems without having to reformat the drive. The driver you need depends on which Seagate drive you purchased. If you purchased a ‘For Mac’ drive you will need to install the HFS+ driver on your Windows computer. If you purchased a standard version of Backup Plus or GoFlex you will need to install the NTFS driver on your Mac computer.
Paragon NTFS Driver - Mac install process
Once restarted you should be able to move data to the drive.
Paragon HFS+ Driver - Windows install process
Once restarted you should see the drive with drive letter in Windows' File Explorer.
Uninstall Paragon Driver
Paragon HFS+ Driver - Windows uninstall process
Paragon NTFS Driver - Mac uninstall process