1989: StorageTek Silo: STK 4400
Old 10.5" round tape reel, 160MB
IBM 3480 5.5" square cartridge, 200MB
STK Silo held 5500 cartridges, 1 Terrabyte
1992, second Silo added, 4 Terrabytes
Cartridges exchanged between the silos
