Alternative Encrypting Applications. If the default operating system encryption methods don't work for you or you want something a little more secure or efficient, there are a few other third-party applications out there for your convenience. WD's My Passport boxes automatically encrypt data as it is written to disk and decrypt the data as it is read back to the computer.
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Format the drive for Time Machine/OSX, if you haven't already, using Disk Utility: Select WD Passport Partition Tab: Volume Scheme - Set Partition numbers required Partition Scheme = GUID Format Type = Mac OS Extended (Journaled) Select this new volume and choose 'Erase' Format Type = Mac OS Extended (Journaled) Security - Zero Data Erase Also - depending how long your drive was on the shelf in the store - uninstall (or do not install) the supplied WD Utilities program, older versions of which conflict with TM. (if you are uninstalling check the launcher has also removed - /Library/LaunchDaemons/com.WDPrivile gedHelper. Plist - if not also delete this).