All Specs The DiskAshur M2 from iStorage (starts at $142 for 120GB, $275 for the 1TB version we tested) excels at the primary mission of any security-focused SSD: making sure that no unauthorized person can ever get their hands on your data. It succeeds thanks to hardware encryption, PIN authentication, and what is, in effect, a self-destruct mechanism should anyone breach its housing. This SSD repels the elements, too, impervious to water and dust, and it's shockproof and crushproof. Like most security-centric external SSDs, the M2 isn't particularly fast as SSDs go, and you do pay a premium for its protective features, but it’s not as dear as many similarly equipped SSDs we have reviewed. That fact and the feature set tip the scales in favor of the DiskAshur M2 as our latest Editors’ Choice winner for secure external SSDs.