A Creative Storage Disk is an item where items from the storage network are stored on. It has to be put in a Disk Drive.

The Creative Storage Disk won’t despawn when dropped in the world.

Uncrafting

Sneak and right click while holding the empty Creative Storage Disk to retrieve the various parts back:

Storage capacity

The Creative Storage Disk can store an infinite amount of items.

It can only be obtained in creative mode.