The Imation 40867 is enterprise level tape media for use with 9840 tape drives. Unlike standard 9840 tape media the 40867 features Volsafe technology. This Volsafe technology provides the most secure WORM (Write Once Read Many) technology in the industry available today, according to the Sun website. Not only that but another key advantage to using 40867 Volsafe BlackWatch tape media is that these tape cartridges comply with regulations. The Imation 40867 has a 40 GB native capacity and 30 MB/s native transfer rate when used with T9840C tape drives. When the 40867 is used with T9840A or T9840B tape drives the native capacity falls to 20 GB and native transfer rate falls to 10 MB/s.