Quantum Scalar i3 Library, 3U Control Module with 3U Expansion Module Includes 25 licensed and 25 unlicensed slots. Ideal for expanding beyond 50 slots or more than three drives, as well as for ActiveVault or Ransom Block requirements Includes: preassembled control and expansion module, internal connection, Ethernet, partitioning, cable spool, power supply, 6U+ rackmount kit and two power cables. Supports Ransom Block upgrades. No drives, SAS/Ethernet cables or media labels included. Maximum of seven expansion modules, 24 drives and 400 licensed slots per i3 library. Please note: The rack must support a product depth of 92.5 cm (36.4 inches)