Datatwin 8 is a peripheral manufactured by Pinboard Computers for the Amstrad PCW 8000 series that adds two external 3.5" disk drives.
It features a control switch that allows selecting between the internal or external drives and choosing their format capacity, 180 or 720KB.
A 720KB 3.5" system disk is included, bundling CP/M 1.15 alongside the respective device drivers required to operate the external expansion units.