The My Passport SSD is compatible with both Mac and Windows, however, we did have to reformat ours from NFTS to AFPS, but this can be done in your Mac's Disk Utility app in just a few seconds the first time you use it. You won't be left wanting for capacity either we tested the 1TB version of the My Passport SSD, however, you can downsize to 500GB if you so wish or upgrade to as much as 4TB for all the storage you could possible need. Transferring 15GB of video files to the drive to almost exactly 15 seconds, which makes it a great option for transferring larger data dumps at the drop of a hat. In practice, we found this to be absolutely true. Officially, it offers read speeds of 1050MB/s and write speeds of 1000MB/s (both sequential). Once it's plugged in, you'll immediately notice the excellent speeds that the My Passport SSD offers. Also durable, the My Passport SSD offers shock and vibration resistance and drop resistance up to 6.5ft. On the move, the last thing you want to worry about is lugging around a big heavy hard drive that takes up lots of room in your bag, the My Passport SSD will fit right into your pocket. If you need portable storage, this is the hard drive for you. It measures just 3.94' x 2.17' x 0.35', so it's the same width as a credit card and ever so slightly longer. In our My Passport SSD review, several excellent qualities became immediately apparent.