Copy Cat 2.0 will skip the bytes which are not readable from files and copy all other bytes. Windows will not usually copy portions of a damaged disk. Therefore it extracts max data which is normally not done by windows copy operation. Copy Cat can be helpful at times when you want to copy a CD or DVD which is scratched,when you want to copy data from harddisk area which is partially not readable , when you want to copy data from floppy which is currently not being copied by windows