IMATION 11776 DLT IV 40GB/80GB Data Tape Cartridge. Protecting your company's valuable data assets is a full time job and Black Watch DTLtape cartridges are built to provide you around-the-clock protection. Imation has over 25 years of experience in the tape cartridge business. In keeping with our tradition of improvement through innovation Black Watch DLTtape cartridges are continuously proving themselves as the next level of highly reliable cost effective data storage media.