If I have to format an external hard drive to make it Mac compatible, will it delete all the content in the external hard drive?

If I have to format an external hard drive to make it Mac compatible, will it delete all the content in the external hard drive?

As others have said, the answer to your question is a big YES.  Formatting a drive will delete everything!
To keep your data, yet reformat the drive for optimal Mac compatibility, you will need to:
1) copy your files to a different hard drive (I would recommend two different locations if you value your data)
2) repartition/format the external drive
3) then copy the files back to the external.
You haven't given details but if you need the external to ONLY be compatible with the Mac (and no longer care if if can be read by Windows), then you will want to partition the drive using the GUID partition scheme, and format as the (HFS+) "Mac OS Extended (Journaled)" filesystem.  You can do so using the built-in "Disk Utility" application on your Mac (in the Applications/Utilities directory).  Here are instructions:
http://support.apple.com/kb/ph5845
If you need the drive to be compatible with both Mac and Windows computers then please post that so someone can recommend a solution for your specific needs.

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