From Seagate Technology:
This software package includes the drivers needed to run Seagate's ATAPI Tape device under Windows NT 3.5.1. It supports CTMA4000 and CTT8000-A IDE TR4 model drives. Please note that there is a problem with Windows NT 3.5.1 and Service Pack 4. If you are using this version, Seagate recommends that you contact them for assistance before installing.