RD31-A Disk Drive

This document, the technical description for the RD31-A fixed disk drive (first edition, November 1985), serves as a reference for service personnel, including field service engineers and repair technicians. It details the drive's specifications, mechanical organization (including the head/disk assembly and stepper motor), and the theory of operation, specifically addressing its electrical interface, read/write channels, and fault detection mechanisms. Additionally, the manual provides step-by-step instructions for installation, unpacking, drive configuration, and corrective maintenance procedures for field-replaceable parts. It is intended to support the servicing of this specific hardware component.