I ripped my CDs to apple lossless and copied to several 1TB WD drives. I use a Squeezebox Touch to play on both of my pretty high end systems. It works perfectly and sounds great.

I listen to flac files I've ripped on an old Oppo BDP-93. The user interface for selecting songs is mildly crude but the sound quality is excellent.

The Oppo BD-Player 103 & 105 can play any Audio-Files from a USB-Stick or USB-Hdd

You can handle it with the Oppo-App on iTunes and Android Devices.

Regards from good old Germany

Rob.