I have recently installed a Seagate IDE tape drive into a server running SME 6.0.1. The drive is labelled STT32000A, but the server's BIOS and the kernel recognizes it as a STT20000A. Both types are supported, and the drive does in fact work fine, storing over 10Gb per Travan 5 tape.
Perhaps you can check whether the STT3401A is compatible with these other models.