Bests & Worsts Reviews from Amazon

To answer most of your questions, this is a great product that every single macbook user should buy, regardless of how much internal storage you have. This review is all based on personal experience with the product. 1. It actually has a little bit more than 128gb on the card free. 2. It does not unmount when the computer is put to sleep, even in the middle of a download. 3. It does not unmount when restarted. 4. It is barely noticeable in the SD card slot and just feels like theres something covering the SD card slot. I have a 2013 macbook air 13.3". I have been able to use it for my Time Machine back-ups, and planning to install a windows virtualization machine, either bootcamp or parallels on it. Although the computer recognizes the drive the moment it is inserted, it does need to be formatted to a mac os only format to take full advantage of it. It is formatted the same way you would format your SSD. MAC OS (journal extended).