///Update: 26Oct2012///After some Googling, I found that it is a common issue with WD that you cannot view two or more HD's plugged in. There are several fixes, but the most common and reliable way is to go to your Computer Management (Windows) and click the unrecognized drive "online". You can then assign it a different Drive Letter which will then allow you to see it every time you plug it in. Without going into too much details, basically WD assigned the same signature to the drives that is why it is showing up as one drive at a time. As a result, I moved the rating up to 5 stars. Enjoy!///Original: 12Oct2012///I love how small it still is (compared to a regular 1TB). When I travel I try to maximize my contents without compromising the weight and space taken. I often have to travel in just a backpack for several days so having the drive is perfect for having my digital movies and tv because it does not require an adapter for power (just USB) and it does not take up so much room. Because of the amount of files I own, I ended up buying 3 of these (only needed 2, but didn't realize I previously bought one already).I do however have some issues with it. Unfortunately, laptops cannot recognize two of the same type of drive. So if you were to transfer files from one drive to the next, you much use a median to temporarily store your data first (ie. laptop itself or a non-WD 2TB Passport Drive).Other than that, I am quite satisfied. Data transfer with USB 3.0 is noticeably superior to USB 2.0. In comparison to cheaper drives with USB 3.0 (not to cause blame on other drives), this performed data transfer faster and more consistently. I have used mine for some time now and through my travels overseas and it is still going strong even with the climate changes (extreme hot in the desert and snowing winter).Bottom line, a must have item for large media files during any time of travels due to its capacity, portability, and size. Just don't expect to be able to plug two at one time to your laptop and see both of them. 

Question: Who is the driver?
Answer: unrecognized drive