Wow, lucky for you I pop on here every 15min or so when I'm bored :P
Okay, for a full explanation of why you were able to fit 702MB, I have to explain a few other things as well.
ATIP Lead-In: The first point at which the CD burner writes on the CD
ATIP Lead-Out: The last point at which a CD burner can burn on a CD, WITHOUT using overburning technology.
Now when you record a CD, it doesn't start at 00:00:00 (minutes:seconds:frames), it usually begins at 97:xx:xx and works it's way to 00:00:00. This extra time is used for calibrating the laser properly, before important data begins to be recorded.
Now the ATIP Lead-Out is what established how much data you can put on the CD-R without overburning. The ATIP Lead-Out can be MANY different things, some examples are: 79:59:74, 74:30:00, and 23:00:00 (80min, 74min and 23min CD-Rs respectivly). And just because 2 different CD-Rs are called 80min CDs, it doesn't mean they share the same ATIP Lead-Out. This is because the ATIP codes are also a way to identify the manufacturer of the media, so everyone uses different combinations of lead-in and lead-out numbers for their CD-Rs.
To figure out how much data you can burn from the ATIP Lead Out, you just follow a simple formula:
Let's take the ATIP Lead-Out 79:59:74, since it is a common lead out. That means 79min 59sec 74frm; In each frame, you can burn 2048 bytes of mode 1 data (mode 1 is used for most CD-R burns that are not audio CDs or VCDs). So simply multiply
2048(bytes) x 75(frames) x 60(seconds) x 79(minutes) and add it to
2048(bytes) x 75(frames) x 59(seconds) and add that to
2048(bytes) x 74(frames)
and you should get the number of bytes that can be burned within 79:59:74 (which is 737,126,400 bytes) then divide that number by 1024 to the number of KB it can store, and then again by 1024 to get the number of MB it can store. This works out to 702.98MB by my calculations.
I've seen some "80min" CD-Rs that could only have 698MB of data stored on them, and others that could have as much as 702.98MB. It totally depends on the manufacturer.
Oh yeah, when you over burn, you don't stop where the ATIP lead-out tells you to.
I hope that explains everything for you! :) |
