APPENDIX A
52
DVD
Digital Video Disc is an upcoming product. DVD specifications include a double-
layer single-sided CD with a capacity of 4.7GB, with sufficient playing time for a
full-length movie, compatible with MPEG-2, and backward compatible.
DVD-RAM
With an initial storage capacity of 2.58 billion bytes, uses phase-change (PD)
technology with some MO features mixed in. A wobbled groove is used to pro v i d e
clocking data, with marks written in both the groove and the land between gro o v e s .
The grooves and pre-embossed sector headers are molded into the disc during
manufacturing. Single-sided DVD-RAM discs come with or without cartridges.
There are two types of cartridges: type 1 is sealed, type 2 allows the disc to be
removed. Discs can only be written while in the cartridge. Double-sided DVD-RAM
discs are available in sealed cartridges only. Cartridge dimensions are 124.6mm x
135.5mm x 8.0mm. DVD-RAM can be rewritten about 100,000 times, and the discs
are expected to last at least 30 years.
FireWir e
The trademark name that Apple Computer uses to identify its implementation of
the IEEE 1394 interface.
Format
In the computer arena, there are physical and logical formats for storage devices.
Magnetic storage devices implement a physical structure (MFM, RLE, IDE, SCSI,
etc.). The standard logical format is defined by the ISO 9660, which specifies the
volume and file structure.
I.E.E.E.
The Institute of Electrical and Electronics Engineers is an association that is a
leading authority in technical areas ranging from computer engineering,
biomedical technology and telecommunications, to electric power, aerospace
and consumer electronics, among others. For more information you can visit
their web site at WWW.IEEE.ORG.
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