What’s the best external. the My Passport SSD external hard drive. As SSDs take up a lot less space than mechanical drives, WD has cut the size of the My Passport SSD down, and it measures just. Meet the Backup Plus Slim from Seagate, yet another portable hard disk drive that uses the tried and trusted ST2000LM007, a hard drive that was unleashed in the first quarter of 2016. The…