RL01/RL02 Disk Drive

This document is a technical manual for the Digital Equipment Corporation RL01/RL02 Disk Drive, a random-access mass storage device. It supports systems like PDP-8, PDP-11, and LSI-11, offering 5MB (RL01K) or 10MB (RL02K) storage per removable cartridge, with up to four drives per controller.

The manual covers the drive's general description, including its "servo-in-data" concept for precise head positioning using embedded track information, and its modular design for easy maintenance. It details the mechanical and electronic components, such as the air flow system, read/write heads, and various logic modules controlling state, velocity, disk speed, and error handling.

System-level descriptions include the disk cartridge format, data format fields, and the drive's operating modes (velocity for seeking, position for track following). Interface-level details explain the controller-drive communication lines, command word structure, and status word for diagnostics.

A significant portion is dedicated to servicing procedures, outlining steps for removal, replacement, checks, adjustments, and alignments of Field Replaceable Units (FRUs) like filters, modules, spindles, and positioners. Appendices provide extensive information on addressable registers, installation requirements (environmental, power, cabling), and toggle-in diagnostic programs for various controllers (RL11, RLV11, RL8-A).