Worth a look in online user manuals (if available) before you order. I was planning to use my LG502sh in exactly the same way as you until I discovered it cannot properly read hard drives or even 8gb usb stick if there are more than 999 individual files (eg album tracks) on drive. In fact I'm still not sure it could read 1/2 that amount properly. Wish I'd read the manual before I bought it

No random play function even if you have a limited number of files to access via USB so you need to select play list each time
Still when laptop plugged into 502 the music stills sounds pretty good.