DAC's and external portable hard drives

Could you give me some names of DACs that do.

Thanks

Can use ps audio direct stream DAC with bridge and Ethernet 

Please provide some more information. Does your computer have a wi-fi signal that will reach the media/audio room? What software do you use to play the music on the computer? What inputs does your DAC have, USB, optical, SPDIF, etc.? What's your budget?

My Oppo 105 had a 2TB Seagate HD attached by usb to it.  I have a Marantz NA 7004, which actually is both a DAC and a Media Player, which does the same thing but very poorly since it is buggy as all get up.  
  I have 2 other DACs—Mytek Manhatten and Bryston DAC-3–that have USB inputs that theoretically could play usb HD, but the problem is controlling the content.  That’s where Media Players come in handy.  With the Oppo, I eventually bought a 19 inch monitor to attach to it which I only use to help navigate the various HDs containing music that attach.
  I think what the OP probably wants is a combination DAC/Media Player.  Lots of choices here.  Cambridge Audio, Bluesound, Aurender, Auralic, Naim..... I would scan the offerings of a company like Audio Advisor or Music Direct.
  Of note in the Home Theater arena, most AV receivers or Controllers do this routinely, and already have monitors to help navigate (your TV set):

My computer is a newer MAC. I believe the wi-fi signal will reach the media room. I mostly listen to vinyl or CD's. My digital tracks are stored in iTunes and I then transfer them to a seagate HD so I can listen to them in my car and I have a few stray digital tracks that are not duplicated by the vinyl or the CD's which I would still like to occasionally listen to in the media room. I currently do not have a DAC. HD has a USB connector. I do not have a budget. I research until I find what I believe will do the best job for me and figure out a way to pay for it after that.

mahler123 I will look into suggestions.

Thanks everyone for your help.