Recordable DVD +/- R Media

[Guest]

Anyone care to comment on the accuracy of the following comments from another
forum?

Also, dual layer and double sided DVD writeable is two different things?!?

Thanks, r.

***********

HI.

To answer your question as to why a dual layer dvd is only 8.5 (8.76 actualy
,depending of data writting format).

The correct term for a dvd DL is actualy DVD-9 (writable) . Long duration hq
movies such as ex. Lord of the Rings (ROTK) is a dvd-9

A standard 4.7gb dvd is actualy a DVD-5.

Simply put it means that the capacity reaches *near* (relative term) to the
higher number. Therefore if it's .5 and above then it's automaticly uped to
the higher DVD capacity class. it's your basic mathamatic "rounding up"

Since overburning and options such as gigarec exist it's conceable that you
could put 5GB on a standard 4.7GB dvd. However there are no garentees as to
if the dvd will be readable in other readers or even your own writer.

Enjoy.

******************

 

[Nathan McNulty]

The writer is a little misinformed, but maybe he can learn. First I
would like to answer your question. Dual Layer and Double Sided are
definetly two different things. Dual Layer is noted as DVD-9 and Double
Sided is noted as DVD-10.

DVD-9 holds 7.95 GB of data and DVD-10 holds 8.75 GB of data.

Dual Layer will not come close to 8.5 GB of data much less 8.76. DVD-9
format is calculated the same way as hard drives which is very
misleading. It calculates a gigabyte as 1000 megabytes instead of 1024.
This ends up giving you 7.95 GB of actual data space to burn to.
Also, the writer believed it would be possible to overburn to 5 GB.
That will never happen since the actual space you have to write to is
really 4.38 GB since again, a Gigabyte on the DVD is 1000 Megabytes
whereas the computer sees a Gigabyte as 1024 Megabytes.

I am not sure about this myth of the naming scheme, but it doesn't
really matter. Here is a list of the DVD Standards, what they are, and
how much they really hold:

DVD-5 Single Sided, Single Layer 4.38 GB
DVD-9 Single Sided, Double Layer 7.95 GB
DVD-10 Double Sided, Single Layer 8.75 GB
DVD-14 Double Sided, Single One Side, Double One Side 12.33 GB
DVD-18 Double Sided, Double Layer 15.9 GB

Now if you want some fun, check out www.bluray.com

 

[Guest]

Nathan,

Thankyou for your reply. Great, through in Bluray to confuse the issue.

So, a commercial DVD movie (ROM) is a DVD-9,Single Sided, Double Layer, 7.95
GB
disk?

I've only seen one DVD-10 (double sided, single layer) commercial DVD movie
- Battlestar Galactica (circa 1975 version). Hmm, I can just hear the under
thirty crowd going... 'Huh, Battle what?'

Thanks again, r.

 

[Nathan McNulty]

Not a problem. DVD's that were made in the mid-90's generally used
single layer and those were the most common to be a double sided instead
of double layer. They also created that weird DVD-14 in the late-90's
as they were having difficulties getting the DVD-18 to produce properly.
Almost all DVD's that are made for DVD Movies today are either DVD-9 or
DVD-18. It makes the manufacturing of these much cheaper.

It is important to note that these formats of DVD's cannot actually be
burned on a DVD+R or DVD-R. A DVD+R\DVD-R closely resemble a DVD-5 and
a DVD+R9 (DVD+R DL) closely resembles a DVD-9. They hold the same
amount of data, but the process of writing data to the disks are
different. Instead of using a laser and organic dye like that used in
recordable disks, they use high intensity lasers to burn pits into the
layers on thd disk. For more info, you may find this site fun:
http://stream.uen.org/medsol/dvd/pages/dvd_format_DVDvsCD.html

Also, to answer your question, DVD-9 is used for commercial DVD-Movies.
So is DVD-5, DVD-10, and recently DVD-18 (DVD-14 has been discontinued).