[wtallis]

You might be thinking of MTP, used by eg. phones that don't present a block device over USB so that they can internally use a filesystem not supported by Windows; MTP is a higher-level interface more akin to a network file system protocol.

mtd is a Linux driver subsystem for accessing raw NAND or NOR flash devices that don't have an SSD's Flash Translation Layer (FTL) in front of them to provide features like wear leveling. It's most commonly encountered in embedded systems.

[worthless-trash]

You are correct, I was thinking of MTP.

Thank you for the education.