Roxio DVDit Pro HD, User Manual

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Appendix A Disc specifications
170
Recordable discs
Type
“Official”
disc size
(see
Note )
Computer
disc size
Disc size in
megabits
(less 4% for
headroom)
Notes on use
BD-R 25 GB 23.9 192,000 Mbits Write-once format for Blu-ray discs.
BD-RE 25 GB 23.9 192,000 Mbits Rewritable format for Blu-ray discs.
DVD R 8.4 GB 7.9 GB 64,512 Mbits These “write-once” discs work with many
set-top players and DVD-ROM drives.
Double-sided 4.7 GB discs are available,
providing 9.4 GB of “official” disc space. A
DVD-Video project fits on one side of a
disc, so to use both sides you must create
two separate projects.
There are two competing “R” formats:
DVD-R and DVD+R. Both formats provide
the same level of compatibility with set-top
players and DVD-ROM drives, but many
DVD recorders support only one format.
There are also two forms of DVD-R:
“General” discs and “Authoring” discs.
General discs can be used only in consumer
DVD recorders. Authoring discs can be used
only in professional recorders and cost much
more than General discs. When buying
discs, make sure to get the kind that your
recorder supports.
3.95 GB “Authoring” discs seem to be more
compatible with older DVD players, but are
becoming rare.
8.4 GB dual-layer discs are just becoming
available. Make sure your recorder supports
these discs before buying them.
1.4 GB discs are designed for use in DVD
camcorders but also work in other DVD
recorders.
4.7 GB per
side 4.38 GB per
side 36,096 Mbits
per side
3.95 GB 3.68 GB 30,336 Mbits
1.4 GB 1.3 GB 10,752 Mbits
DVDit_Pro_HD.book Page 170 Monday, September 25, 2006 2:32 PM