Confusion with blank dvd.

firubbi · Post by **firubbi** » Sun May 28, 2006 8:15 am

A blank dvd labeled 4.7gb is showing 4488mb in nero! (disk info)
Anyone has any idea? I need to write a 4650mb vdo file in single dvd.
thanks

Shroomz~> · Post by **Shroomz~>** » Sun May 28, 2006 8:25 am

If you're just transfering the file from one location to another I'd use winrar to archive the file before writing it to DVD. Winrar can achieve some serious compression.

firubbi · Post by **firubbi** » Sun May 28, 2006 8:36 am

thanks Shroomz. but does your dvd shows the same like mine?

astroman · Post by **astroman** » Sun May 28, 2006 8:55 am

if you have 4650 MB to write that's effectively 4.761.600 KB
sometimes K means 1024, sometimes 1000.

the DVD needs format information plus error correction data, so there's a significant overhead.
if that's a video file you might consider re-encoding it with slightly less resolution (unnoticable)

cheers, tom

Shroomz~> · Post by **Shroomz~>** » Sun May 28, 2006 10:30 am

Hi,
we get a reading of 4.399mB in Nero & 4.29 in XP sp2.

ChrisWerner · Post by **ChrisWerner** » Sun May 28, 2006 11:37 am

The manufactors of DVDs calc only with the multiplier 1000 instead of 1024.
So a blanc 4.7GB DVD can only store ~4.49GB.

The error correction datas are stored in a space outside the 4.7GB.

For example a normal CD has a total capacity of 1GB but aprox. a third of it is used for the error correction datas.
Audio uses less error correction datas than Data CDs. That´s why a CD can store 80min of music but only 700MB of computer datas.

samplaire · Post by **samplaire** » Sun May 28, 2006 2:24 pm

4.2 giga available on a Macintosh. No need to cry

firubbi · Post by **firubbi** » Mon May 29, 2006 3:30 am

error correction data. thats the case

thanks you all