Covenant storage device

The Covenant storage device is a form of storage for information used by the Covenant, similar to the UNSC's own data crystal chips. The block consists of a brick-shaped chunk of a superdense material unknown to humans. Its capacity is apparently unknown as well, but it is likely to be significant.

Though humans do not fully understand the technology, they are still capable of retrieving the data from these devices, or their AI constructs can at least.

While being held captive by the Gravemind in High Charity, Cortana used a storage device to store a message aboard a Flood-infested battlecruiser headed for Earth. Based on their cursory analysis, the Sangheili forces thought the storage device held Cortana herself, but after John-117 retrieved the device it turned out to only contain a recorded message.

Trivia
In Halo: Combat Evolved, these devices can be seen on the sides of some of the Covenant supply cases.

List of appearances

 * Halo: Combat Evolved
 * Halo: The Flood
 * Halo 3