Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Announcements and Chat > General Discussion

Reply
 
Thread Tools Search this Thread Display Modes
Old 20th August 2003, 18:37   #1  |  Link
applebee9
Registered User
 
Join Date: Aug 2003
Posts: 2
7 Gb Data DVD

I have a DVD that has 7 gig of data (through nero or windows file explorer).

How is that possible? and can you create a backup of it?

Thanks
AB
applebee9 is offline   Reply With Quote
Old 20th August 2003, 19:34   #2  |  Link
killingspree
Newbie Forum Mod
 
killingspree's Avatar
 
Join Date: Aug 2002
Location: way too deep in (cyber)space
Posts: 2,436
what kind of data is on it?
pls give more details
steVe
__________________
Search the forum, read the forum rules once more and use the search function on doom9.org before posting!
oh btw my amazon.de wishlist
killingspree is offline   Reply With Quote
Old 20th August 2003, 20:19   #3  |  Link
Latexxx
Registered User
 
Join Date: Nov 2001
Location: Tampere, Finland
Posts: 618
It might just be a good old fashion dual layer dvd which is created by pressing to discs and glueing them together. These are also known as dvd 9 and most of the movies ship on them.
__________________
A/V moderator @ hydrogenaudio.org
My weird old sh*t: http://www.nic.fi/~lhahne/
http://last.fm/user/Latexxx/
Latexxx is offline   Reply With Quote
Old 20th August 2003, 23:45   #4  |  Link
Sirber
retired developer
 
Sirber's Avatar
 
Join Date: Oct 2002
Location: Canada
Posts: 8,978
@Latexxx

Could you give me more infos about the creation of dual-layer DVDs?
__________________
Detritus Software
Sirber is offline   Reply With Quote
Old 21st August 2003, 00:15   #5  |  Link
dvd_maniac
Registered User
 
Join Date: Feb 2002
Location: northeast/usa
Posts: 830
no

you can't make a backup of dual layer dvd's containing data. movies can be shrunk by making rhe bitrate smallr.data can also be zipped, but usually has to be unzipped before running it.
dvd_maniac is offline   Reply With Quote
Old 21st August 2003, 01:00   #6  |  Link
jggimi
Moderator Emeritus
 
jggimi's Avatar
 
Join Date: Dec 2001
Location: The NW corner of Lake Erie
Posts: 5,552
More information that you'll ever want to know about dual-layer discs is available from The Official DVD FAQ. The link is in Doom9's DVD Basics section.
jggimi is offline   Reply With Quote
Old 21st August 2003, 18:43   #7  |  Link
applebee9
Registered User
 
Join Date: Aug 2003
Posts: 2
Thanks

That was very helpful information. So then its probably a dual layer dvd. i'll just store the data on the hard disk then.

killingspree - its just a standard dvd. nothing special. its published by microsoft.

Thanks All
AB
applebee9 is offline   Reply With Quote
Old 21st August 2003, 20:39   #8  |  Link
Latexxx
Registered User
 
Join Date: Nov 2001
Location: Tampere, Finland
Posts: 618
Quote:
Originally posted by jggimi
More information that you'll ever want to know about dual-layer discs is available from The Official DVD FAQ. The link is in Doom9's DVD Basics section.
I had a quick on those and I didn't get any info regarding dvd manufacturing. So here is a short version.

A single layer dvd (dvd 5) is created by pressing a disc and attaching it to a another piece of plastic (yes, even a single layer dvd has two layers (or at least it should have)). This makes the dvds more fault tolerant (they don't bend as much as cds). [(This is not true)It is also required because the data on dvds is written in smaller "font" as on a regular cd and a scrach on the disc hurts many more bytes than on a cd.(but the error correction is better)]

A dual layer dvd (dvd 9) is done by storing information on the both layers and then putting them together.

Please correct me if I'm wrong.
__________________
A/V moderator @ hydrogenaudio.org
My weird old sh*t: http://www.nic.fi/~lhahne/
http://last.fm/user/Latexxx/

Last edited by Latexxx; 22nd August 2003 at 11:07.
Latexxx is offline   Reply With Quote
Old 22nd August 2003, 04:14   #9  |  Link
int 21h
Still Laughing
 
int 21h's Avatar
 
Join Date: Oct 2001
Location: Around
Posts: 1,312
Quote:
Originally posted by Latexxx
...It is also required because the data on dvds is written in smaller "font" as on a regular cd and a scrach on the disc hurts many more bytes than on a cd...
This is a common misconception. It is true that DVD data is four times as dense as CD data, but the error correction at work on DVD is in the neighborhood of 9 or 10 times more efficient than CD. Not too mention a multitude of other factors (ECC constraint length) that contribute to a better overall chance of recovering from an error.
int 21h is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 08:44.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.