Memory buffer
A memory buffer was a component of a starship's short term data storage.
In 2375, The Doctor discovered his short term memory buffers had been deleted. This proved to be a clue that someone had tampered with his programming to prevent him from remembering recent events. (VOY: "Latent Image")
In 2383, Rok-Tahk rebuilt Hologram Janeway's holographic program after she was deleted. She was only able to do so because the memory buffers for Janeway's program hadn't yet been overwritten. (PRO: "Time Amok")