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Example filesystems include TFTP, represented by TFTP:, Flash Memory, represented by Flash:

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Ram, or System: and NVRAM or NVRAM: and USB Flash

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and as an example, you may have USB flash 0 or USB flash 1.

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This is dependent on what's available in your router.

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So on the 1841 show, filesystems allows us to view various filesystems available on the router notice

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system, NVRAM, Flash, TFTP, RCP, FTP and others.

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Now Opaque represents a logical internal filesystem used for internal functions and commands.

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Network is an external file system, so notice network for TFTP, network for HTTP, FTP, and others.

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So network represents an external filesystem of different servers using different protocols, disk

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is used for Flash, and this is the place where the Cisco iOS is going to be booted from by default.

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Notice the hash sign or pound sign, USB flash is used for USB flash and NV

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RAM is nonvolatile RAM.

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That's where the startup config is stored.

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The show running-config command displays the running-config found in system.

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The show sort up config command displays the startup-config found in NVRAM and Show Flash refers

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to the default filesystem, which is typically Flash 0.

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So once again, show run shows us the current configuration found in system.

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Show startup-config shows us the saved configuration found in NVRAM and show flash shows us the 

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built-in flash on the router.

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So as an example here, we only have

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one flashcard available, but you may have more depending on the router that you're working on. As an

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example, we could say copy

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and notice all the options, so let's say copy NVRAM, 

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I noticed there are different options here, including

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the startup config. So startup-config

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and let's save that

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in Flash

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as copy start.

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cfg, 

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show flash,

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there's our copy start config, and if we use the command more flash copy

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start config

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this shows us the copy of the startup config that we copied from NVRAM.