An ATA changer is a type of device used to automate the process of switching disks in a disk storage system. It typically consists of a robotic arm that can access and remove disks from a series of disk cartridges or slots, and move them to a tape drive or other storage device.

ATA changers are often used in backup and archival storage systems, where large amounts of data need to be stored and managed over time. By automating the process of switching disks, an ATA changer can help reduce the need for manual intervention and improve the efficiency of data storage and retrieval.

In addition to the robotic arm, an ATA changer may include various other components, such as a barcode scanner for identifying disks, a control panel for managing the device, and software for controlling the operation of the robotic arm and other components.

Overall, an ATA changer can be a useful tool for managing large amounts of data in a storage system, and can help to improve the efficiency and reliability of data storage and backup processes.