Bubble memory
From Tardis Wiki, the free Doctor Who reference
Bubble memory was a type of computer memory that retained information even after power has been removed. It was used by the Logopolitans, (TV: Logopolis [+]Loading...["Logopolis (TV story)"]) as well as being produced on Earth by Geocomtex. (PROSE: Products [+]Loading...["Products (feature)"])
The Fourth Doctor took it so he could use it on the Pharos Project computers. (TV: Logopolis [+]Loading...["Logopolis (TV story)"])
Bubble memory were listed among Geocomtex's "world-gripping" products on a page on their website. (PROSE: Products (feature [+]Loading...["Products (feature"])
