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Can I format the CF in a cisco 1800 router and then use it on the ASA 5520?

Can I format Compact Flash in a cisco 1800 router and then use it on the ASA 5520?

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You don't have to format the

You don't have to format the card in the router. You can do that on your PC. Just format the CF-card as FAT32 and plug it into the ASA.

BUT: If you just want to "upgrade" the old card with a different one, then first attach the original card from the ASA to your PC and copy all files (including the hidden ones) to your PC and then copy them back to the new card. That way you also move your licenses to the new card which are stored in hidden files and your private data like keys.

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