This dataset was downloaded in 2020 from the public root directory of the Chandra Data Archive (CDA), and it includes all the primary and secondary products of the public Chandra observations. Unlike the CDA, this dataset is not updated in real time. There are four main data directories: science, cal, er, and byobsid. The science directory contains all public General Observer (GO), Guest Observer (GTO), Target of Opportunity (TOO), and Director's Discretionary Time (DDT) observations. The cal directory includes all celestial calibration observations. The er directory contains all engineering (non-celestial) observations. The byobsid directory provides direct access to data products by Observation ID (ObsId). There is also a directory for archival purposes: the arcftp directory, which stores various documents and files related to archiving. The er directory has a subdirectory for each calendar year. For more details, please read the README files located in each directory level.