Holo-Disks are Dweller created storage devices used to store thousands of files. they are mostly found within The Library.

However, they are more commonly used to store the data of a single event/tech.

the Dwellers have placed DNA-locks on them so no other race could discover the content of a Holo-Disk. they do this because they think it would disrupt the galactic balance. they could grant a species a Holo-Disk with a modified DNA-lock with a tech they are permitted to have.

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