> It's a binary state, either the drive is functional and the CD in decent condition No. How good the drive is at reading marginal discs varies a lot between

> It's a binary state, either the drive is functional and the CD in decent condition No. How good the drive is at reading marginal discs varies a lot between drives. The problem is, these populations are not identical disks, and the error rates are low enough that we're not really sure we're seeing a good metric of this.