iwould recommend to use another DVD drive - your's seems to be used for a while and some older model (we also have often troubles with mirror door G4s and/or older superdrive models). they mostly just loose track and OS X doesn't tell if the error is based on a CRC reading error or something else - it actually copies corrupted data.
another issue often noticed is bad RAM, which turns up to be problematic after a while of copying or loading.
i don't think we have an answer on the question if the drive / DVD gets unusual hot - you can copy (carefully, possibly with some breaks) tthe installation files to a location on your harddisk and run the install from there.
if the message comes up *corrup file* copy and overwrite the .cab-file where the message appeared (the error says wrongly that package.info would be corrupt, whereas in effect it is the copied .cab-file)
christian
another issue often noticed is bad RAM, which turns up to be problematic after a while of copying or loading.
i don't think we have an answer on the question if the drive / DVD gets unusual hot - you can copy (carefully, possibly with some breaks) tthe installation files to a location on your harddisk and run the install from there.
if the message comes up *corrup file* copy and overwrite the .cab-file where the message appeared (the error says wrongly that package.info would be corrupt, whereas in effect it is the copied .cab-file)
christian
and remember: only a CRAY can run an endless loop in just three seconds.