I have an external USB stick (Kingston DataTraveler 3.0). I can read the files on it (I have some movies that I can play) but I can't add anything to it or delete anything that's on it. I've tried to format it using Disk Utility but I keep getting this error:
Error: -69877: Couldn't open device
Nothing I found online seems to work. It is very annoying because the disk is obviously fine since I can access all the files. Does anyone know anything I could try? Thanks so much.