Hugh, I suspect that you might never find the information in the format you expect. Technology companies tend not to define failure in such black and white terms. Rather media such as hard disks are measured in terms of failures over time. As conditions worsen the reliability decreases, but people tend to leave the threshold of failure to be interpreted within the scope of the application. After all this is the rational behind RAID arrays; that is using less reliable disks with an expectation that one but not all will fail. If you can not find anything I would be happy to help you cook a few tapes for the betterment of mankind. Gerard List archives at http://lists.ufl.edu/archives/recmgmt-l.html Contact [log in to unmask] for assistance