Rescuing file from rainbow book audio CD - block size? 2019-04-30 23:37:33 A file - not an audio track. From multi-session audio CD - not a CD-ROM. Disc isn't healthy, and ordinary file system copy commands fail. File isn't something anyone's life depends upon, but I'd like to get out as much as possible. * For the lack of something better, I am using bbcopy: http://alter.org.ua/soft/win/bb_recover/ . Any other suggestion would be welcome.* I can set block size. Should I use [a multiple of] anything in particular? 588? Or? Is it drive-dependent?