■ STORAGE
Aharon Yadin · 2016
MASS STORAGE is chapter focuses and elaborates on various aspects of storage. By using the general architecture gure, we can relate to the storage devices (disks) in the system (Figure 9.1). Storage Devices Every computer system, like any living creature, includes the means to store and later retrieve data. As seen in Chapter 5, “Memory,” which discusses the memory hierarchy (Figure 5.5), there are various levels of storage. In general, the memory-either the main memory or the various cache levels-is considered as the main level. However, these memories are volatile and temporary and maintain the data stored as long as it was not replaced or as long as the system is operational. is volatile memory includes the rst levels in the hierarchy (registers, cache, and main memory). For that reason, additional devices for long-term storage are required. e following levels of hierarchy are for media storage that does not need to be connected to an electricity source to maintain the data stored. Furthermore, the data is saved even if the system is nonoperational.