Backup Plus and GoFlex Desk Thunderbolt Software
The Seagate Thunderbolt adapter driver is only needed if you are using Backup Plus or GoFlex 3TB or 4TB drives with the Thunderbolt adapter and plan to change drives with other Backup Plus or GoFlex adapters (such as USB or FireWire). If you do not intend to use the drive with other adapters, it can be reformatted and the software is not needed.
FreeAgent GoFlex Software
This is an updated version of software for Windows 8 users.
NTFS Driver for Mac OS
The NTFS Driver (5MB) allows you to mount the NTFS partition on supported Seagate drives as read and write (NTFS would normally be read only in MacOS), so the drive can be used to drag and drop files between a computer running Mac OS and one running Windows.
SeaTools for Windows
SeaTools for Windows tests SATA, USB, 1394, ATA (PATA/IDE) and SCSI drives. It is installed on your system. SeaTools for Windows is completely data safe. If the drive passes SeaTools for Windows, your troubleshooting can move to other areas.