Re: A writeable CD left on window sill
I have just gone through a data refresh project - discs which were written and then filed in individual sleeves in a disc storage case, with silica gel left inside. Stored in a fireproof safe.
Those from 2005 are *mostly* readable. There was a ~5-10% failure rate, and those discs were looked after rather well. It is possible that the data was corrupt when written.
Unfortunately I am no longer in that role, and the 2001 discs were next on the list...