D2D (Direct-to-Disc)
To make a direct-to-disc recording, musicians typically play a 15-minute "live" set in a studio for each side. During the performance, the analog record cutting head engages the main lacquer from which the sides of an LP record are ultimately derived. Technically, direct-to-disc recording is supposed to allow for more accurate and less noisy recording through the elimination of up to four generations of master tapes.