"Oh, and virtually no PC on earth has that kind of I/O throughput; a Sun Enterprise server might, but a PC does not. Most don't come within a factor of five, assuming perfect realtime behavior."
It's generally the lack of synchronization and positioning information compared to data CDs that gets you. In particular, on many older drives you can't reliably start the rip at the same place each time, so even if all the corrections and fixups work perfectly and you get a bit-exact rip (which isn't hard) you still won't get the same file twice.
