A filesystem (or file system) is a computer’s method of controlling how data is locally stored and retrieved. All computers have a filesystem, although the specific system each uses depends on the particular operating system.

IOS Filesystem

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You can view the file systems of a Cisco IOS device with show file systems


There are several filesystem types:

  • disk: storage devices such as flash memory
  • opaque: used for internal functions, these are not discrete physical devices, but rather logical internal systems
  • nvram: Non-Volatile RAM; startup-config is stored here
  • network: external filesystems, such as TFTP servers