Ergonomic and fast

Product Feature:
-500 GB of disk space (including 465 recognized by Windows)
-Integrated USB 3.0 (700 MB divX transferred in 18 seconds with an average speed of 45 mb / sec)
-Size: About 8cm of 6 cm (the size of a passport)
-USB Cable supplied with the package (the USB cable used to supply Hard Drive)
-Formaté NTFS (MAC OS so it will reformat it to FAT32)

So I put it 4 stars because I find it really very ergonomic, it fits in the pocket, I can take it anywhere, plus it does not require mains power, the USB cable is sufficient to make it work.
The hard drive incorporates "western digital" programs I could not find useful, so I reformatted the hard drive directly.
I take it one star for its transfer rate (some will take me for a fool) for indeed it is compatible with USB 3.0 and the rate of 45 mb / sec seems to me insufficient to USB 3.0 as found easily on the other hard disk of 60 mb / sec speeds.

Another point to check: reliability, for this I will update my review.
MAJ: I use the hard drive daily for 5 months now and I've had no problems at all.