Note: I HAVE tested this hard drive on BOTH PC & MAC operating systems, and they both work immaculately well. If need be, sometimes it is recommend to partition your hard drive BEFORE you test your hard drives on different platforms.* This hard drive is a steal. Not only is it compact, but it gets the job done when it comes to placing files within the hard drive, and making life a breeze. Be mindful that sometimes older computers cannot detect 3.0 based usbs for devices, but this one is quite helpful in both 3.0 and 2.0 ports. If you're not sure that the device isn't being read by your computer, simply shut down the computer (Not just the restart button), and power your computer back on. I can guarantee you, your issues will be resolved. So far, have had this 1TB drive for well over a month, and I can confidently say, that Western Digital is not only one of the best company's out there today, but the do make quality products.