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MDR - GCSE Computer Science Definition

Reviewed by: Robert Hampton

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What is the MDR?

The Memory Data Register (MDR) holds the data or instruction that has been fetched from main memory (RAM) during the 'fetch' stage of the fetch-decode-execute cycle.

It acts as a buffer between the CPU and main memory.

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Robert Hampton

Reviewer: Robert Hampton

Expertise: Computer Science Content Creator

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.

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