Upgrading a Cisco IOS Software Image into Flash Memory
Lesson 4: Cisco IOS Images
Cisco routers do not usually have a disk drive. Instead, they use other types of memory for different purposes, as shown in Figure 20-1.
Figure 20-1 Types of Router Memory and Their Different Purposes
Routers usually store IOS images in flash memory. Flash memory is rewriteable, permanent storage, which is ideal for storing files that need to be retained when the router loses power. Cisco purposefully uses flash memory rather than disk drives in its products because ...
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