Very robust! 6

I have risen and connect the WD 4TB external hard drive, and pull data from my hard drive had become too small over went without problems. But then after about 3 weeks of second shock !! The drive much of my desk on the tile floor because I preferred the table and a cable was too short. The board was to even and I thought ok that's it ... When I picked it up I see that the case was from strange at one point, but the hard drive was still running! I look at the time and there is no problem to retrieve the data, it still works as before. The case I have pushed back into its groove and you can watch her fall only when you know what you have to pay attention. What a miracle! The hard disk has now lasted over a year and since it actually runs with every time I turn on my PC (daily). I never buy again something other than WD I swore. :)

Supplement (July 2014):
Hab now my 2nd WD Book ordered (both 4Tb) and am still inspire.
However, there was a minor problem, as the two hard drives have the same ID, and therefore were not recognized at the same time of Windows.
Did then googled a bit and very quickly found a guide in order to change the ID of a and since her anything goes.

Here are the instructions:

Meanwhile, Microsoft has performed well as an improvement of its tools in Windows 7, it is possible with Diskpart to do that with board funds.
At the command prompt as an administrator:

> Diskpart (call the command line tool, it then appears in front of the box diskpart>)
DISKPART> list disk (displays the existing boards 0-n)
Diskpart> select disk n (selecting one of them for subsequent processing)
Diskpart> detail disk (particularly interesting is the existing volume identifier of the selected panel n)
diskpart> uniqueid disk id = hhhhhhhh (eight hex digits h: 0-9, af as a new ID for the drive type n)
DISKPART> exit

Questions like to see in the comments, I'll try it every now and again.