EMC Disk Library 3D 4000 provides data deduplication capabilities for new and installed DL 4000 systems. With the 3D 4000 option, you can add capacity optimization and more efficient replication to your DL 4000 virtual tape library system without sacrificing performance, availability, and flexibility. And, the 3D 4000 enables you to replicate using IP connectivity so you can reduce costs while improving your data protection and archiving strategies.