CD-R Capacity?

vbimport

#1

from the info below, does this mean that the potential MB capacity, or amount of data that COULD be stored to the CD-R is 702.83MB OR (736.97MB)

                        Media Information                            

Format Capacity Blank Disc
Free Blocks 736966656
Free Capacity 702.83MB(736.97MB)
Media Type CD-R
ATIP Start Time of Lead In (Media Code) 97m27s58f
ATIP Last Possible Start Time of Lead Out 79m59s74f
Manufacturer Name Mitsui Chemicals, Inc.
HD-BURN Certified NO
Available Write Descriptor CLV 40.0x 6000KBps
Available Write Descriptor CLV 32.0x 4800KBps
Available Write Descriptor CLV 24.0x 3600KBps
Available Write Descriptor CLV 16.0x 2400KBps
Available Write Descriptor CLV 10.0x 1500KBps
Available Write Descriptor CLV 4.0x 600KBps

                       Complete Media Code

#2

702.83 megabytes or 736.97 million bytes. 1 megabyte = 1024 kilobytes = 1024*1024 bytes = 1048576 bytes.


#3

of course if your burning mpgs , because error correction isnt used you can fit over 800mb on a 700mb dvd ( ive overburnt 817mb on one of my svcds) :slight_smile:


#4

thats very cool !


#5

unless you changed case they are both megabytes not bits. my guess would be that the paren # is the OVERBURN capacity. as you can read if you do a little searching cds don’t magically end exactly at 702mb there is extra capacity. i have gotten as much as 742 out of a cd.

the svcd thing mentioned has to do with error correction. data cds have 3 layers of error correction. svcd has either 1 or none which frees up the error correction space for more data


#6

736.97/702.83=1.048575. 1.024*1.024=1.048576. Six decimal places is a little too much of a coincidence to be explained as overburn capacity. My bet is on the reporting software trying to be helpful and accomodating both binary and decimal definitions of a megabyte. As simple as that.


#7

Are you sure? I thought SVCDs have 2 layers (like audio CDs)… none would mean that even a C1 error would be unrecoverable.


#8

doesn’t even bother to error correct i think it just blows on past the errors

read [here](http://www.doom9.org/mpg/vcdsvcd_faq.htm#How many minutes of video can I fit on a VCD / SVCD)

then click on How many minutes of video can I fit on a VCD / SVCD


#9

That information on doom9 seems to be wrong. All formats have C1 and C2 error correction, but you can disable the CU correction normally used in data discs if you burn in Mode2Form2 mode, which saves you 304 bytes per sector and thus lets you fit 807.5 MB on a SVCD. See e.g. Omion’s post in this thread. Since you can make bit-perfect copies of (S)VCD, there has to be error correction, otherwise you couldn’t even dream of doing this due to the thousands of C1 errors any disc has.