The Paragon Driver allows you to use your Seagate drive with both Windows and Mac operating systems without refromatting 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 you restart you should be able to move data to the drive
Paragon HFS+ Driver - Windows install process
Once you restart you should see the drive with drive letter in Windows' Explorer/File Explorer
Uninstall Paragon Driver
Paragon HFS+ Driver - Windows uninstall process
Paragon NTFS Driver - Mac uninstall process