Quality Standard

Pacific Video Media uses only professional grade pro series DVDs and CDs for duplication. This is done to ensure the highest quality and playback rate possible. DVD-R discs are usable on virtually any compatible DVD playback device, including DVD-ROM drives and DVD video players.

Overview
DVD Recordable (DVD-R) technology allows anyone to create DVD discs at the desktop. Similar in concept to Compact Disc Recordable (CD-R), DVD-R is a write-once medium that can contain any type of information normally stored on mass produced DVD discs – video, audio, images, data files, multimedia programs, and so on. Depending on the type of information recorded, DVD-R discs are usable on virtually any compatible DVD playback device, including DVD-ROM drives and DVD Video players. A DVD-R disc is able to contain a maximum of either 4.7 or 3.95 billion bytes of information on each side, depending on the type of blank media used. Since the DVD format supports double-sided media, up to 9.4 Gbytes can be stored on a single double-sided DVD-R disc. Data can be written to a disc at a DVD "1X" equivalent of 11.08 megabits per second (Mbps), which is roughly equivalent to nine times the transfer rate of CD-ROM’s "1X" speed. After recording, DVD-R discs can be read at the same rate as mass-produced replicated discs, depending on the "X" factor of the DVD-ROM drive used. These transfer rates, coupled with DVD-R’s capacity and conformance to worldwide DVD standards, makes it an extremely viable and cost effective storage medium.

DVD-R Technology
DVD-R is a write-once format, meaning that data can be written to a disc and stored without fear of accidental erasure. The fundamental technology employed is similar to that used by CD-R, except that data is written at a higher rate and density. DVD-R, like CD-R, uses a constant linear velocity rotation technique to maximize the storage density on the disc surface. This results in a variable number of revolutions per minute (RPM) as disc writing/reading progresses from one end to the other. Recording begins at the inner radius and ends at the outer. At "1X" speeds, rotation of the disc varies from 1,623 to 632 RPM on 3.95 Gbyte media and 1,475 to 575 RPM on 4.7 Gbyte media, depending on the record/playback head’s position over the surface. On 3.95 Gbyte media, the track pitch, or the distance from the center of one part of the spiral information "track" to an adjacent part of the track, is 0.8 microns, one-half that of CD-R. 4.7 Gbyte media uses an even smaller track pitch of 0.74 microns.