If the memory is formatted, all data (songs, videos, photos, etc., including sample data installed at the factory, bundled software installer, and the Help guide) will be erased. Be sure to verify the data stored in memory prior to formatting, and export any important data to the hard disk of your computer.

Be sure not to initialize (format) the built-in flash memory of your Walkman using Windows Explorer or Finder on Mac. If you have formatted with Windows Explorer or Finder on Mac, format again using the Walkman.