What are you looking for in an external drive? If you answered security and safety, then SecureDrive BT may be a good fit for you. If you are storing sensitive files, and value protection over everything else, accept no exceptions.
SecureDrive is a line of encrypted hard drives that are FIPS certified. The SecureDrive BT is a password protected drive controlled entirely via blue tooth on your smart phone.
This drive can be locked and unlocked completely remotely- and can be wiped at the press of a button in case sensitive information is lost.