Working with Flash
We have non-volatile storage available to us, this may be an internal flash or pluggable CF, in many devices we have USB. To identify the file systems we have available to us, type the command show file systems
Router#show file systems
File Systems:
Size(b) Free(b) Type Flags Prefixes
* 64016384 12822561 flash rw flash:
29688 23590 nvram rw nvram:
Router#
In this case, we have two file systems, flash (which is default) and nvram. On larger devices (for example, chassis-based switches) There can be many spare storage locations in the file system. To view the contents of flash, type show flash
Router# show flash
System flash directory:
File Length Name/status
3 50938004 c2800nm-advipservicesk9-mz.124-15.T1.bin
2 28282 sigdef-category.xml
1 227537 sigdef-default.xml
[51193823 bytes used, 12822561 available, 64016384 total]
63488K bytes of processor board System flash (Read/Write)
I can clearly see any files stored in flash, including my software image. I can also see how much free space I have, very important if I want to copy a new IOS image to the flash!
Just to finish off, have a look at the contents of flash and nvram using the dir command….after all we still have not found our start-up configuration file. Try the commands dir flash: and dir nvram:
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