1- what's the largest size of external hard drive I can connect
Not sure the largest but I have a 512GB flash drive (formatted HFS+) and it works great
2- must the ssd be self powered or will a portable unit work
portable will work if you plug it into external power
3- is there a max # of tracks that a cdj/xdj of new gen can recognize???
I have 40K+ tracks on my drive and it reads it fine on the NXS2, Not sure about the 1000