From: Robotics (Autochangers, Jukeboxes, Stackers, Libraries)

Odetics makes a thing called a DataTower that holds ~250 S-size D-2
cartridges. It used to be, but is no longer, sold through EMASS for
use with the ER-90 (the Ampex/EMASS D-2 drive). It's a small silo that
sits in front of one rack of drives.

They also make an expandable library known as the DataLibrary, with a
maximum capacity of ten petabytes(!) (ten million gigabytes). A robot
handler runs on a track down an aisle lined with cartridges, and tape
drives at one (both?) end(s) of the aisle. I think the aisles can vary
in length, and they can be lined up next to each other and I believe
cartridges will pass between them.

(Note: since their acquisition of GRAU (above) EMASS no longer sells
Odetics. I don't know if these are still available directly from
Odetics and who you'd get to do the integration work. (rdv, from
Dave.Barnes@fox.emass.com (Dave Barnes), 1996/3/22))