Roxio DVDit Pro HD, User Manual

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Recordable discs
171
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The “official” DVD disc sizes are confusing because they do not follow the conventions
used for other digital media. In the DVD world, 1 Gigabyte is 1,000,000,000 (10
9
) bytes,
whereas in the computer world, 1 Gigabyte is 1,073,741,824 (2
30
) bytes. Therefore a 4.7 GB
DVD contains less data than a 4.7 GB hard disk.
DVD RW 4.7 GB 4.38 GB 36,096 Mbits The rewritable version of DVD R. There are
two competing “RW” formats: DVD-RW
and DVD+RW. When buying discs, make
sure you get the type that your recorder
supports.
These discs are compatible with fewer
DVD-ROM drives and set-top players than
DVD-R or DVD+R discs. Their main
advantage is that they can be overwritten
about 1,000 times, so you can use them for
testing, or update the project later without
having to use a new disc.
1.4 GB 1.3 GB 10,752 Mbits
DVD-
RAM 4.7 GB per
side 4.38 GB per
side 36,096 Mbits
per side These discs were originally designed for
data storage rather than DVD-Video. They
can be played only in PC DVD-RAM drives
and in a few DVD-ROM drives and set-top
players.
Discs can be single- or double-sided. A
DVD project fits on one side; to use both
sides you must create two separate projects.
DVD-RAM discs can be overwritten about
100,000 times.
2.6 GB per
side 2.42 GB per
side 19,968 Mbits
per side
1.4 GB per
side 1.3 GB per
side 10,752 Mbits
per side
Type
“Official”
disc size
(see
Note )
Computer
disc size
Disc size in
megabits
(less 4% for
headroom)
Notes on use
DVDit_Pro_HD.book Page 171 Monday, September 25, 2006 2:32 PM