There's no need to disable 2 factor Authentication google, you can simply set-up an App Password on your account.
To setup an app password:
Visit here while logged into your Google account: https://security.google.com/settings/security/apppasswords
Select App > Other. Name it whatever...
Just wondering your opinions, I haven't done any research into S5 yet.. I was thinking about WD but a friend told me they were garbage last season. Cheers!