Portable hard drive, 2.5-Inch
Unlike 3.5 external desktop drives, 2.5 portable drive do not require a separate power source. Such drives can be connected using USB or Thunderbolt connection. This makes them very convenient for travel or for carrying them around. That is why many notebooks and some desktops use them.
When choosing portable drive, it is recommended that you select one that is durable and lightweight. Also, since portable drives are generally slower than desktop drives, select a faster drive.
Beside their ease of portability, the most endearing feature of such drives is their plug and play capability. No formatting and no special software is needed! Just plug the device and voila, it comes to life and is immediately usable!