Ermal3k

A few weeks ago I started getting this pop up every time I turn on the navi. "Caution: Track log memory is 90% full. Im guessing It has to do with the SD card that I use for playing music. Any ideas how to get rid of it or what it is? Ive also attached a picture. Thank you Ermal

How do you put a password on it? I got an Avic Z2.