[lindenr]

Does this mean that a 10^13 reliability has 320% chance of failure?

EDIT: in any case the correct calculation should be http://www.wolframalpha.com/input/?i=%281-%2810^-14%29%29^%2... which gives a 30% chance of failure, versus http://www.wolframalpha.com/input/?i=%281-%2810^-15%29%29^%2... for a 3.5% chance.

[ars]

320% would mean you find 3 wrong bits each time you read the disk.

I was calculating the expected number of wrong bits per full read of the drive.

You calculated the chance of a perfect read which is similar but not the same.

[lindenr]

Ah, I see. Could you edit your post to reflect this? As it stands it is very easy to misinterpret.