Silicon Power Armor A62 IPX4 Waterproof and Shockproof 4TB Portable HDD Review
 

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.

http://www.madshrimps.be/articles/article/1001250/