Entry

what is dvd?

Dec 22nd, 2007 12:31
Khalid Saleh, Articles Way,

DVD stands for Digital Versatile/Video Disc, DVDR stands for DVD 
Recordable and DVDRW for DVD ReWriteable. If you're familiar with 
regular audio/music CDs or regular DVD-Video discs, then you will know 
what a recordable DVD looks like. A recordable DVD 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 DVD 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.

There are three competing DVD Recording standards, DVD-R/DVD-RW and 
DVD+R/DVD+RW 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 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 and DVD-RW 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 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 and DVD+RW 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-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.

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