Data pads

Were you looking for Data pad, the in-universe piece of technology? The Data pads are hidden computer pads encountered throughout the Halo: Reach campaign. Similar to the Terminals found in Halo 3, the pads contain their own, self-contained story, presented as exchanges between members of a mysterious AI collective known as the Assembly.

A total of 19 data pads can be found at various locations in the campaign, with at least two data pads in every campaign level. Each data pad is numbered; letters or words are replaced with numbers in each data pad message representing the number of the data pad. Data pads numbered 1-9 can be found on any difficulty settings whereas data pads 10-19 can only be found on the Legendary difficulty settings.

Data pad 10
This data pad might be how the Covenant discovered Earth since it is one of the hardest data pads to find and was carried by a Sangheli.

External

 * GamesRadar: Halo: Reach - Data Pad location guide