Despite the mental image of Dan Aykroyd and Bill Murray hosing
down poltergeists, IsoBuster 2.7 isn't a disc wiping utility or some
such, but a recovery program that can retrieve data from damaged or
accidentally reformatted CD/DVD/HD DVD/Blu-ray discs. Success will
vary with the problem (the disc must be at least readable by the
drive), but I did manage to grab some data from a deliberately
reformatted CD-RW. IsoBuster supports ISO9660, Joliet, UDF and even
the Mac HFS/HFS+ systems.
IsoBuster's other claim to fame is its ability to read and extract data from a large number of image formats (images are the contents of an entire disc or partition written to a single file). Supported formats include Mac .dmg files and those from most of the big vendors, notably Nero's .nrg. Check the Web site for a full list of supported formats.
If you need to recover data from an optical disc that Windows or other programs won't recognize, IsoBuster is definitely worth a shot. It's an affordable gamble and doubles as a handy image reader/extractor (though if that's all you need, the free Daemon Tools is a better bet).