I was tasked with transfering a large collection of cd-r media to hard disk. About 10% was unreadable or corrupted. I have not had a shelved hd go bad yet. I ha

I was tasked with transfering a large collection of cd-r media to hard disk. About 10% was unreadable or corrupted. I have not had a shelved hd go bad yet. I had an amiga 3000 from 92 boot after 25 years of inactivity. Also booted up a classic 8088 that was stored in a basement for about 30 years. No problems with either. Looks like a shelved hd is a cheap and reliable archival option. On a long enough timeline I would expect all cd-r media to be unreadable.