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If you need lots of extra storage space in a compact package, the LaCie D2 Thunderbolt 2 is a great accessory for your Thunderbolt 2-enabled Macs.
The WD My Book Duo is a fast, versatile, and secure way to add lots of storage space to your desktop computer without digging a hole in your pocket.
The LaCie 2big Thunderbolt Series strikes a balance between capacity, performance, and price and would be a good choice for owners of Thunderbolt-enabled computers.
Seagate BlackArmor 440 is a workhorse NAS server that combines the currently largest possible amount of storage with an average number of features and performance that could be better.
The WD My Book Thunderbolt Duo makes a very good external storage device for Thunderbolt-enabled Macs thanks to its comparative affordability, ease of use, and decent performance.
If you have a Thunderbolt-enabled computer, the Promise Pegasus R6's storage capacity, its features, and especially its performance are worth the hefty investment for those who demand fast external storage.
The My Book Studio Edition II makes a decent direct-attached storage solution for those who need to extend a computer's storage space or want a large backup drive. The drive's rather buggy firmware might turn many users away, however.