DSD

DSD is the format used for Super Audio CD's. Please see the article on DSD at Wikpedia more information.

Your DAC must support it. Only a few do.

DAC's that support DSD include: Playback Designs

DSD Sources

Blue Coast Records

http://www.ps3sacd.com/dsd_downloads.html

Ripping Super Audio CD's

Article at computeraudiophile.com on ripping SACD's on an old PS3.