Essentials models are encrypted (except in those markets where encryption is illegal, eg Russia).
Passport models are usually encrypted.
BTW, when Windows is telling you that your drive needs to be initialised, it means that it cannot make sense of the partition information in sector 0.
If instead Windows is telling that the file system is raw and that the volume needs to be formatted, then this is probably due to the fact that some enclosures (eg 3TB/4TB My Books) are configured with 4KB sector sizes. When you install such a drive inside your computer, you expose the drive’s native 512e sectoring. Sector 0 is still in the same place, so the partition information is still accessible, but every other sector is out by a factor of 8. In other words, you now have a 4Kn file system on a 512e physical drive.
