I'll say it again.....computer audio is how 99.9999 percent of all music is recorded.....mixed and mastered today. Playing back files on your computer has the potential to be as close to the final mix as possible....for the good or bad of it. People are so hung up on usb....well, today's usb sounds as good as last year's firewire thanks in part to asynchronous. So much so that I no longer use firewire to playback tracks for mixing. Anyway....If you don't like usb buy a mytek with a firewire port.
Again.....listening to a hard drive is how recording engineers mix. After sending out for cd pressing, the cd wi be compared to the two track file from a hard drive to ensure a proper pressing.
Also....I for one am glad that disc drives have been pushed to the back of the bus. Do you know how many laser problems occur with dvd drives. It is a crap shoot to even invest in a top player due to the short life laser problems. And....hard drives are so cheap that backing up your files in incredibly easy and fast.