How to make hdd hfs or fat 32 from raw format without erasing

I need to change an hdd from raw that got messed up in windows back to hfs which it was originally or fat 32 if it doesn't mess up or delete the files Need help!!!!!
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More about make format erasing
  1. you cannot change the file system of a HDD without formatting it.

    best you can do is Copy its data to another drive, reformatt it and copy it back after.

    this will NOT work with an operating system drive.
  2. this was a basic external formatted for fat 16. What is the safest way to get the data off?
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