What on earth is a +D?

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The +D is a disk interface for the Sinclair Spectrum range of computers. It was made by Miles Gordon Technology in the late 1980s as a cheaper version of the Disciple disk interface. It shed the Disciple´s joystick and network interfaces, and also its ´Interface 1´ look. It retained however the snapshot button and printer interface.
The disk format used by the +D and Disciple are also supported on the Sam Coupé.