Even if it was 99.9999999999%, then statistically you would experience 110 corrupted bytes in every terabyte of data you move. Doesn't that worry you at all? When you rebuilt the imaginary disk array you speak about above, you'll have no redundancy, (unless you're running RAID 6, and even then you could only hope to IDENTIFY the error, not correct it).
You are using the wrong set of figures in your calculations. If 99% of errors are eliminated you can do nothing to extrapolate the number of errors remaining without reference to the starting error rate - here you assume that all reads even from a good disk are errors. Use the same set of figures consistently and the position becomes a lot more difficult to justify.
Biting the hand that feeds IT
