Buffalo's TeraStation DN is a high performance 4-bay network storage with a 10GbE connection and hard drives built for always-on NAS g: TSDN. The detailed specifications, photos and introductory video of the Buffalo TeraStation DN (TSDN) NAS. The list of the competitors most often compared. Especially designed for use in NAS systems, the TeraStation's hard drives feature highly new technologies for highly reliable and stable operation. The drives.