These can only be used in Conquest.

Data Disks can be added at specific nodes in each sector. They offer special buffs that apply to one or more of your units for the duration of the Conquest. Data disks don’t have a purchase cost, but you’re restricted by the maximum Data Capacity for the Conquest version you’ve chosen. The total capacity of all Disks you use must be equal to or lower than the maximum. Tap on a disk to view its effects and capacity.

The other items you can use in Conquest are Consumables, which are only effective for a certain number of battles. If you’re defeated, you can reuse the same consumables on your next attempt with no penalty.

There are currently three types of Consumable which you can buy from the Conquest store, and you can equip one of each type.

If you overwrite a Consumable you were using with another one, it destroys the original and you won’t get it back in your inventory.