It is quite great that we are now seeing 2.5’’ portable drives breaking the 2TB barrier and are now available with capacities of up to 5TB (not counting the multi-drive enclosures). The MQ04ABB400 drive enclosed in the Armor A62 with 4TB of storage capacity does have a rotational speed of 5400RPM and makes use of the 128MB of cache for boosting read/write speeds when using lots of small files. While this model is noted by Toshiba as being highly reliable, Silicon Power builds on this and includes a rugged plastic/silicone casing for IPX4 water resistance, is 122cm military grade shockproof, while the textured surface protects against scratches and fingerprints.