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Flash file system

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

The flash file system is a Cisco IOS file system backed by flash storage and used as the default file system.

The flash file system is Cisco IOS's default physical storage file system. It stores and organizes device files and is addressed with the flash: prefix. section 8.4

Use these commands to inspect and manage flash storage:

  • Run show file systems to view available IOS file systems. section 8.4
  • Run dir flash: or show flash: to list flash contents. section 8.4
  • Run more flash:/filename to view a file's contents. section 8.4
  • Use copy source destination to transfer files, such as copy tftp://server-ip/src-filename flash:/dst-filename. section 8.4

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines the file-system role and supplies inspection, viewing, and copy commands without describing flash-storage internals.
Examples
Uses show file systems, dir flash:, show flash:, more, and TFTP-to-flash copy commands.
What you can do after
Operate flash storage through IOS inspection, file-viewing, and source-to-destination copy commands.
How it connects
Connects flash storage with Cisco IOS file systems, TFTP, NVRAM, running-config, and startup-config.
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