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This document gives some background information on the magnetic tape recording process employed in a Modular Data Acquisition System (MODAS) for use in harsh airborne environments, and highlights some of the more important problems encountered in producing an acceptable low error rate digital pcm recording. Advice is given on magnetic tape handling and storage which is generally applicable to high density tape recording. Also, methods of optimizing the equalization of the MODAS ground replay system are described so that users can ensure that the complete system is operating to full performance at all times. Keywords: Great Britain, Reproduce amplifiers.