A:AnswerIf you format the drive as Fat32, you can use it with any major desktop or laptop operating system, including Chromebook, Windows, Mac OS, and Linux.
A:AnswerThe size, format and number of those photos will determine how many photos you can put on the drive. Using the basic size and format, quit possibly several thousand photos can be stored. Again it all depends size, format and quantity of your photos.
A:AnswerYes, you can either connect to PS4 and format it to store games and apps, or format with a computer and use it to store media that you can use the PlayStation Store Media Player App to watch movies, see and download pics, etc.
A:AnswerYes, it will work just fine in a 2.0 port. No guarantees the transfer speed will be the same as in a 3.0 port, I haven't tested that, but it should still work.