So I have a 32GB SD card and I just got a small SD reader that allows me to keep it plugged in at all times. First, is this okay to do or is it not recommended to keep it plugged in? Second, if it is ok what should I use it for? I use dropbox so I do not need it to transfer files. I still have plenty of space left on my SSD. What do you use your SD card for on your macbook?