The Aurender A10 has a 4TB hard drive. If you want to load your CD's on the hard drive you must first "rip" them to FLAC, WAVE, AAIF or some other format. I use dB Poweramp, a very popular and effective ripping software, to convert the the CD files to FLAC format on my computer. Once the ripping process is complete, you can simply "drag and drop" the ripped files into one of several folders of the Aurender's Library.
If all of your CD's already reside on a flash drive or hard drive, you can import them directly to the Aurender's Library via the provided USB connection. You can also download "Hi-res" files from providers like HD Tracks and drag and drop them into the Aurender Library.
You will also need an iPad to run Aurender's Conductor App. This allows you to access the Library and play your music, make playlists and customize your settings. The Conductor App is extremely well designed! Don't forget that the A10 is a DAC and streamer all in one box and it is MQA certified so you can stream over 3500 complete MQA albums from Tidal not to mention millions more in CD quality.
Let me know if you have any questions.