Master and slave cylinders also exist for break cylinders and guess what computer hardrives were largely historically before flash? Rotating cylinders of some s

Master and slave cylinders also exist for break cylinders and guess what computer hardrives were largely historically before flash? Rotating cylinders of some sort even if the memory was tape. That are literally "driven" by the master. Having no motive of their own only driven by the master. It is a tasteless pun metaphor at worst.