80minute CD... equals 800mb?

[deethree]

I read on one of the pages that 1minute = 1mb. So all this time I've spent trying to sqish 4minutes out of a XViD in order to get it on a 80minute CD is for nothing? heh.

Normally I wouldn't worry about it, my old HP didn't allow for overburning, but this new LG dvd burner does.

I tried the over burning once with a file, it was 714... but the video came out all washy/distorted... I figured it was something to do with the settings in Nero.

*sigh*

so... 80min = 800mb? if not whats a decent app to easily take out a few minutes here or there so I can watch "home movies". ?

[TBoneit]

um, err... the 80 minute cd equaling 80 minutes video is only tru for VCD (MPEG1 352 by 240 @1150kb) video.

For XVID/DIVX it is by the megabyte not minutes. So a 30 minutes Xvid that is 720 MB won't fit but a 120 minute Xvid that is only 690 Mb would fit.

Clear?

[adam]

EDIT: My mistake, I thought he was converting xvid to (S)VCD. TBoneit is correct, though it is possible to burn anything in mode 2 using certain procedures and this will grant you the full 800MB capacity, but its not recommended due to the lack of error checking.

If burning in mode 2 which is what VCDs and SVCDs use, then yes it works out to about 800mb on 1 80 min cdr.

If the data is too large to fit the cdr you will most likely get a warning before you start burning, and if not then you will get an error when space runs out. After this happens the disc will most likely be unreadable. But if your video is washy/distorted than it shouldn't have anything to do with running out of disc space.

There's all kinds of things that could have happened to cause those problems, so its probably best to just give it another shot.

[Cornucopia]

It's all about sectors and modes.

An 80 min. CD is 360,000 sectors (give or take)

Audio mode is 2352 bytes / sector
Data mode 1 (or XA Mode2,Form1) is 2048 bytes / sector
Data mode 2 is 2336 bytes / sector
Data XA Mode2,Form2 is 2324 bytes / sector

So,

# sectors * # bytes / sector = # bytes (or MB)

and that gives you...

Audio = 807.49MB
Mode1/Mode2Form1 = 703.125MB
Mode2 = 802.002MB
Mode2Form2 = 797.882MB

Therefore, available space is governed by HOW you are writing to disc:

Data files are 99.99% Mode1. This is why you've been running short.
You can get tools to write to a Mode2Form2 sector format-type disc, but if you do, you will be sacrificing the better/additional error correction and that's taking chances...

Scott

[hech54]

They make 90 minute CDR's too...I've used several of them with my LG and Prassi Ones ....works like a charm though I was making music CD's.

[Cornucopia]

I'm glad you've had good experiences with them, but the fact is that they aren't compliant the way 74/80 min discs are, and will therefore not always work for some/many players. That's fine for some things, but I wouldn't put one-of-a-kind material on there--too risky.

Scott

[MOVIEGEEK]

90/99min CD-R's work on all my players,although they are hard to find nowadays.Mode 2 Data should work on most DVD players but you might try first with a CD-RW.

[hech54]

I also read about the compatibility issues with 90's....especially in car players (audio CD) but have yet to find anything that my discs won't play in.

[psx_pirate]

Actually an 80 min cd is only 700Mb (74 min cd = 650Mb) but you can squeeze a little extra on by using overburn ... this is not recommended tho as it can lead to data corruption in the overburned part of the cd and overburning is very much drive dependent ... some drives can overburn more than others, whilst some drives can't do it at all, NOTE: appling to much overburn can kill your drive

[adam]

psx_pirate, as stated above, the actual capacity of an 80 min cdr is about 800MBs. The 700MB rating is due to the fact that 100MBs of that capacity is used up by error checking information whenever you burn in mode 1. You are still storing 800MBs worth of data each time you burn an 80min cdr to full capacity.

And when burning mode 2 or audio, you get to use that full 800MBs for your data.

[hech54]

Actually an 80 min cd is only 700Mb (74 min cd = 650Mb) but you can squeeze a little extra on by using overburn ... this is not recommended tho as it can lead to data corruption in the overburned part of the cd and overburning is very much drive dependent ... some drives can overburn more than others, whilst some drives can't do it at all, NOTE: appling to much overburn can kill your drive

Also if you use a 900MB CD (as in my case) and I burn 899MB to the disc....or even exactly 90 minutes of audio to that disc....that is not overburning.

[piano632]

NOTE: applying to much overburn can kill your drive

How does overburning kill your drive?
I've overburned several audio CD's, though usually it's with 650mb discs where I need 75-76 min.

[MOVIEGEEK]

How does overburning kill your drive?
I've overburned several audio CD's, though usually it's with 650mb discs where I need 75-76 min.

Overburning up to 90sec.(ie. 75:30 on a 74min CD) is considered safe for drives that support overburning:
http://users.pandora.be/erik.deppe/cdrmedia/overburning.htm