I bought an Auralic Altair and I dont know how to listen musics via the HDD (usb) .
Does someone help me how to get it?  
I have an Aries Mini but should be pretty much the same download your files to your HD and connect it wirelessly or via USB to the Aries. You need to download the Lightning DS app and find your HD and it will create a library of your music. That's it and it applies to hi-rez and all recordings. I think that is  what you are asking if not please clarify. And good luck you will love streaming!