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Question About Fitting XGD3 onto Dual Layer DVDs

This discussion thread has 9 messages.

#1
It never occurred to me before to find out the actual size of a DVD+R DL but now I'm wondering about it.

The Gears 3 ISO is 8.13 GB.
The DVD+R DL disc is 8.5 GB.
This leaves .37GB of space.

Shouldn't the XGD3 ISOs fit right on with no problem? Apparently they don't (which I already know). ?I'm wondering why they won't, when there is supposedly 370MB left over.

Are the dual layers truly 8.5GB or are they less than advertised?


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#2
They are less. Kind of like an 80gb hard drive is like 74GB actual space. I think 8.5 comes out to like 8.15 or something similar.
#3
I figured it was something like that. I'm gonna check out a Verb and a Memorex when I get home Monday.


#4
dont say memorex around modking,,,
#5
memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex. i have out of over 200 memorex have had only three bad ones
#6
Originally posted by cooll903:
i have out of over 200 memorex have had only three bad ones
Here we go again...........


#7
Quote:
The Gears 3 ISO is 8.13 GB.
The DVD+R DL disc is 8.5 GB.

The reason this doesn't work is because you're comparing GB (the size of the disc) with GiB (the size of the Gears ISO). You're using 2 different scales.

Disc manufacturers use GB as a measurement of storage, which is 1,000,000,000 bytes. Computer systems use base 2 though, so a GiB is 2 ^ 30 bytes, which is actually 1,073,741,824 bytes.

Therefore if you take a DVD+R DL disc, the capacity in bytes is 8,547,991,552.

8,547,991,552 / 1,000,000,000 = 8.548 GB (or thereabouts), so when most people say that a DVD+R DL is "8.5 GB" it's this figure they're talking about.

But in terms of computer systems, the capacity is this: -

8,547,991,552 / 1,073,741,824 = 7.961 GiB.

So using GB as the scale: -

Gears 3 = 8.739 GB
DVD+R DL = 8.548 GB

Or using GiB as the scale: -

Gears 3 = 8.139 GiB
DVD+R DL = 7.961 GiB

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#8
Originally posted by funksoulb:
So using GB as the scale: -
Gears 3 = 8.739 GB
DVD+R DL = 8.548 GB

Or using GiB as the scale: -
Gears 3 = 8.139 GiB
DVD+R DL = 7.961 GiB
Understood.
Either way, same result. ISO Larger than disc.


#9
Originally posted by funksoulb:
Quote:
The Gears 3 ISO is 8.13 GB.
The DVD+R DL disc is 8.5 GB.

The reason this doesn't work is because you're comparing GB (the size of the disc) with GiB (the size of the Gears ISO). You're using 2 different scales.

Disc manufacturers use GB as a measurement of storage, which is 1,000,000,000 bytes. Computer systems use base 2 though, so a GiB is 2 ^ 30 bytes, which is actually 1,073,741,824 bytes.

Therefore if you take a DVD+R DL disc, the capacity in bytes is 8,547,991,552.

8,547,991,552 / 1,000,000,000 = 8.548 GB (or thereabouts), so when most people say that a DVD+R DL is "8.5 GB" it's this figure they're talking about.

But in terms of computer systems, the capacity is this: -

8,547,991,552 / 1,073,741,824 = 7.961 GiB.

So using GB as the scale: -

Gears 3 = 8.739 GB
DVD+R DL = 8.548 GB

Or using GiB as the scale: -

Gears 3 = 8.139 GiB
DVD+R DL = 7.961 GiB
thanks, that makes a lot of sense now
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