If you are using any CD burning software check if you have the option to increase the maximum capacity of the Audio to burn it. Overburning (if your burning software and burner supports it) is always done using Disc at Once. If you need more playing time that is up to 85 minutes, some CD burners will let you "overburn" into the blank CD space so as to extend the playing time by a further few minutes. What program are you using to burn audio CDs on your computer?īecause audio CDs must always contain uncompressed stereo audio, they are necessarily limited to a capacity of 74 to 80 minutes playing time respectively.If you overburn, you can typically achieve about 1-2 minutes of additional capacity (depending on your drive and media). Overburning is where you burn MORE sectors than the disc is rated for. All these capacities are available BEFORE overburning. This is where the often quoted capacities of 740MB and 800MB come from.
Now, since S/VCDs are not composed of PURELY video tracks and have some unavoidable overheads, the actually total capacity left for video tracks is a few Mb less for each disc (about 735 Mb for 74min discs and 795 Mb for 80min discs). Due to the fact that S/VCDs use a different burning mode where MORE of each sector is available as user data, the relatively capacities are HIGHER.
The often quoted capacities of 650MB and 700MB refer to CD-ROM capacities. MODE2 Form2 for VCD and MODE1 for CD with DATA. So, as you noticed the main determinant is the burning mode of the disc. Additional space per each sector isn't used for error codes, the space is used for something other than video data (e.g., sync headers). The capacity of VCD is almost maximal (797.9MB of 807.5MB or 738MB of 746.9MB). VCD and SVCD CDs occupy 98.8% of all sectors. Audio CDs do not contain correction codes, because it's possible to interpolate from the adjacent audio samples. For audio CDs errors aren't important as for CDs with data.
That's why capacity of audio CD is maximal (100%, 807.5MB of 807.5MB). The burning mode for CD with DATA is either MODE1 or MODE2 Form1.Īudio CDs occupy each byte of all of sectors. The CD-R FAQ has the details, but in effect, only 2048 bytes out of a total of 2352 bytes in each sector is available for user data on a data CD. Thus, for CD-ROMs, part of each sector is devoted to error correction codes and error detection codes. A single bit error could lead to a program being unexecutable or ruin an archive file. That is, errors (indeed frequent errors) could be made during the reading. CDs with data and CD reading mechanisms are not faultless. Each sector has 2352 bytes.ĭATA CDs occupy only 87% of all sectors (700MB of 807.5MB or 650MB of 746.9MB). Real maximal size of 700MB CD is: 807.5 MbĬD consist of sectors. Real maximal size of 650MB CD is: 746.9 Mb 50MB or 700MB - is a maximal size of CD intended for DATA.
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