Q:
What
are"DVD", "DVD-R" and "DVD-RW"?
A:
DVD stands for Digital Versatile/Video Disc,
DVD-R stands for DVD Recordable and DVD-RW for DVD ReWriteable. If you're
familiar with regular audio/music CDs or regular DVD-Video discs, then
you will know what a recordable DVDR/W looks like. A recordable DVDR/W
stores up to 2 hours of very good quality DVD-Video, including several
audio tracks in formats like stereo, Dolby Digital or DTS and also advanced
menu systems, subtitles and still pictures that can be played by many
standalone DVD Players and most computer DVD-ROMs. If you choose to
lower the video quality it is possible to store several hours video
on a recordable DVDR/W using low bitrates and low resolution with video
quality more like VHS, SVHS, SVCD, CVD or VCD. It is also possible to
have up to 4.37* GB ordinary data or mix DVD-Video and data on a recordable
DVD that can be played by most computer DVD-ROMs.
Q:
How
many recording standards or formats are there?
A:
There are three competing DVD Recording standards,
DVD-R/W and DVD+R/W have pretty similiar features and are compatible
with many standalone DVD Players and most DVD-ROMs while DVD-RAM has
less DVD Player and DVD-ROM compatibility but better recording features.
DVD-R
and DVD-RW
DVD-R/W was the first DVD recording format released that was compatible
with standalone DVD Players.DVD-R is a non-rewriteable format and
it is compatible with about 93% of all DVD Players and most DVD-ROMs.
DVD-RW is a rewriteable format and it is compatible with about 80%
of all DVD Players and most DVD-ROMs.
DVD-R/W supports single side 4.37 computer GB* DVDs(called DVD-5)
and double sided 8.75 computer GB* DVDs(called DVD-10). These formats
are supported by DVDForum.
DVD+R
and DVD+RW
DVD+R/W has some "better" features than DVD-R/W such as
lossless linking and both CAV and CLV writing. DVD+R is a non-rewritable
format and it is compatible with about 89% of all DVD Players and
most DVD-ROMs. DVD+RW is a rewritable format and is compatible with
about 79% of all DVD Players and most DVD-ROMs. DVD+R/W supports single
side 4.37 computer GB* DVDs(called DVD-5) and double side 8.75 computer
GB* DVDs(called DVD-10). These formats are supported by the DVD+RW
Alliance.
DVD+R
DL
DVD+R DL or called DVD+R9 is a Dual Layer writeable DVD+R. The dual
layered discs can hold 7.95 computer GB* (called DVD-9) and dual layered
double sides 15.9* computer GB (called dvd-18).
DVD-RAM
DVD-RAM has the best recording features but it is not compatible with
most DVD-ROM drives and DVD-Video players. Think more of it as a removable
hard disk. DVD-RAM is usually used in some DVD Recorders.
This format is supported by DVDForum.
* In
the computer world is 1 KB data = 1024 bytes so 4 700 000 000 bytes
/ 1024 = 4 589 843KB / 1024 = 4482MB / 1024 = 4.37GB.
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