A system, apparatus, and method are disclosed for conducting an inventory of a data storage library. The invention includes providing a plurality of data storage slots for storing data storage cartridges, providing an accessor having a plurality of detectors mounted thereon, and concurrently detecting cartridge information with the plurality of detectors for a corresponding plurality of data storage slots. The detectors may include any combination of detectors, including but not limited to, bar code scanners, radio frequency readers, cartridge presence sensors, or cameras. In certain embodiments, the invention also includes associating the cartridge information with the corresponding data storage slot and storing the information on a data bearing medium.