Is there a way to recover data from a cracked CD-R ?
The cd is cracked in half.
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M$3 Answers
Since CD readers spin the CD at high rotation rates and only move the reading head radially (i.e. toward the center or away from it), the CD in question has to be nearly perfectly balanced for any data to be readable. If a CD is cracked or bent, it will most likely not be possible to spin it in the CD reader, making it impractical for almost anyone to get data off that CD.
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M$
Information bits are writen sequentially on a CD in a spiral format, not spread across.So like @opher said it might be possible to recover the data atleast from the region not damaged, but would be an expensive to get the tools.
Yes, sequential is true, but what I meant was that there are many blocks (330,000) each which contain data. Files written to the CD-ROM wouldn't necessarily follow any pattern, and reassembling something like a program with multiple files would be impossible. One could potentially get back small files, text files (although incomplete would still be easy to get some of the data back), and parts of large binary files (but it may be very difficult to unlock any data from them).
Mostly from personal knowledge, but you can read about CDs and how they work at http://electronics.howstuffworks.com/cd.htm and/or http://ezinearticles.com/?How-Does-a-CD-Player-Work?&id=293429 which also give a bit of information about what happens if there is damage (e.g. scratches) on the CD.
Whats your source on this?