Flash memory error on Cisco 3640

By Anon on Thu, 07/17/2008 - 9:20am.

Average: 5 (4 votes)

I have a Cisco 3640 but with not enough memory. I believe I have the right FLASH cards but every time I plug in these new cards, I get an error saying: "device does not contain a valid magic number" "boot: cannot open "flash:" boot: cannot determine file name on device "flash:" your help is appreciated, thanks.

Answer by Ron Nutter

Expert's answer

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Cisco
LANs / WANs
Cisco 3640

you need to format the flash

By Anon (not verified) on Fri, 07/18/2008 - 3:14pm.

you need to format the flash that is why you are seeing the message about the flash not having the magic number

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Cisco 3640 flash memory problem

By sly (not verified) on Fri, 01/23/2009 - 6:51am.

Hello Guys,

I'm experiencing the same problem too with my 3640 router. I recently did an ios upgrade from 12.3(22) to 12.4(16) which failed and as a result, it reduced my flash memmory to 16MB. Before the upgrade, I could see 64MB of flash memory. I need to know how I can recover my lost memory in flash and be able to install the 12.4(16) ios.

Thanks

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