Removable Disk Cartridges or RDX come in multiple storage capacity options and these are the 4TB ones. The 4TB RDX Cartridges are hard disk drives with the capacity of 4TB set in RDX docking stations, making them long-lasting and also easy to use. These can be some excellent choices for archival backup and data storage due to the supporting software, drag and drop facility of accessing files and file accessing speed of up to 360GB/Hr.