Alright, I am about to upgrade one of my older systems from a 120GB SATA disk to a 250GB SATA disk. In preparation, I am running a final differential backup on the drive. It correctly detects which files I need and then spends about six and a half hours compressing most of them, but ALWAYS fails with a CRC error. The thing is, it isn't telling me if the error is on the external HDD or my internal one. I have run long and short drive tests on both and both pass. I've run scandisk. I am beginning to think that this may be an issue within Toucan. How can I get more info than "data error (CRC)"?