I recently got a new 2TB WD Passport external HD (USB 3.0). It's taking forever to be encrypted on my 2015 rMBP. It's been 3 days now, and it's only at ~35%. Is something wrong? When I encrypted my 1TB (thunderbolt) HD, it took about 1 day to encrypt fully. I'm using the encryption option in macOS Sierra (right click the drive on the desktop, then click Encrypt). Thanks!