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 numeral.

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.

Trivia

 * The Covenant storage device was thought to have held Cortana in it. After fighting through the level Floodgate, the Master Chief manages to retrieve it in the in the infected ship. Later, when the device is repaired by 343 Guilty Spark, it turns out to only contain a message from Cortana while she was inside High Charity.
 * In Halo: Combat Evolved, these devices can be seen on the sides of some of the Covenant storage crates.