Guide to Cataloging DVD and Blu-ray Discs Using AACR2r ... - OLAC

eplicated in specialized factories. Duplication refers to recording, i.e., burning data to a
disc (as you would do with your own computer). It is fairly easy to tell if a DVD has
been duplicated because it will have a purple or brown colored bottom side. In addition,
a duplicated disc holds only 4.7 GB per recorded side, while a replicated DVD supports
up to 17 GB of recorded data.
Replication (also referred to as “pressing” or “molding”) is the method of manufacturing
or mass producing DVDs where the data or audio information is physically stamped on
the discs. Replicated discs are usually made in large quantities for retail distribution
and have a silver backing.
Future Developments
Just as the DVD Forum comprises companies that are
interested in the development of the DVD, the Blu-ray Disc Association
is a “group of companies dedicated to
developing and promoting the Blu-ray Disc format,” and the HVD forum
supports research and development of the holographic
storage disc. These organizations and their websites are excellent resources for
extensive information about the formats. Readers will find press releases, technical
developments, summaries of the industry standards, and frequently asked questions
with answers.
The DVD Forum announced in 2005 that it had approved specifications for “DVD Multi,”
a set of hardware specifications designed to enable disc compatibility for virtually all
formats officially created by the DVD Forum. Players with the Multi logo would be
compatible for all discs including DVD-RAM and DVD-RW and recorders with the logo
would have the capability to write to all the formats.
The developers of the holographic disc emphasize the superior storage capability of the
HVD format and market this format for companies who need the high storage capacity
of the holographic disc. “One 5 ¼ inch-diameter optical disc can store up to 150 million
pages – more than 63 times the capacity of DVD. Also, with holographic recording, a
multiple of form factors, such as discs, cards, etc. and laser wavelengths (red, green,
and blue) can be used.”
. The HVD Forum promotes the holographic disc as the replacement
for DVD.
Several quotes from DVD Demystified (3 rd ed.) speak to the future of DVD technology.
The author’s insights and projections are particularly relevant. “In the very long term, the
Internet will merge with cable TV, broadcast TV, radio, telephones, satellites, and
eventually even newspapers and magazines. Discrete media such as DVD will then be
relegated to niches such as software backups, archiving, time-shift ‘taping,’ and
collector’s editions of movies. In the intervening years, however, DVD in all its
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