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7.1 Introduction Description History Modules (HMs) are mass storage devices that store software, system files, system data, and user data. Most data stored in any HM can be accessed by any node on the LCN. HM location in the TPS System An HM is a node on the LCN. It includes an electronics kernel (the foundation electronics package in every node), a Smart Peripheral Controller (SPC), and from one, two, or four Winchester disk drives. LCN Electronics Kernel SPC/WDC Winchester Disk Drive History Module 2959 7.1.1 HM Options and Variations Types of drives 60 Two types of Winchester drives are in use in HMs. While there are some physical and electrical differences in these drives (refer to History Module Service), the difference that matters to system engineers is the storage capacity of each type, which is as follows (KB = kilobytes = 1024 bytes): • Wren III (Type 3) 135,900 KB • WDA 210 215,040 KB • WDA 445 454,130 KB • WDA 875 896,032 KB • WDA 1.8GB 1,836,736 KB Engineer’s Reference Manual 06/04
