This file is usually stored in the flash memory, since this type of memory will retain the stored files even after the router is powered off or rebooted. The IOS image is a single file that is loaded into RAM when the device boots. rw means that the file system is read/write. disk represents the flash memory, and nvram represents the NVRAM memory Free(b) – free memory in the file system (in bytes).Size(b) – total memory in the file system (in bytes).In the command above you can see that I have two file systems available on my device. To list file systems available on your device, the show file systems EXEC mode command is used: R1#show file systems For each memory device available on the device, a file system called IOS file system (IFS) is created. The startup configuration is stored in NVRAM. Cisco devices usually use integrated flash memory to store IOS software images and other files (e.g.
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