On Thursday, January 26, 2023, Ralph Corderoy <ralph@inputplus.co.uk> wrote:

Rob Pike wrote of magnetic tapes he had which could no longer be read.
The coating had failed off IIRC.  I tried to find the text but failed.
Perhaps it was on one of those Google+, Posterous, ... transient things.

Hi Ralph, I think you’re referring to this blog post (which I’ve also previously struggled to find): https://commandcenter.blogspot.com/2014/08/prints.html