When I was about 4, I believed that if you scrub a vinyl record hard enough, long enough, with enough soap, you could erase what was on it and record your own songs there instead. I was never quite able to do this successfully, (this was before recordable CD's, or any CD's actually), but I did render several vinyl records completely unplayable.
A childhood belief about technology

others believed things like this
- I used to believe that records were the power source for record players.— bob
- I used to think a world record was a record of all the people in the world singing .— JACK REGAN . [SWEENEY . ]
- I used to believe that you could only play a record once, and after that all the sound was wiped off.Anon
- I used to believe that if you played a record too many times it would wear it out.— April
- i used to believe you couldn't draw on erasers with pencils because it would erase itself— Samantha
- I used to believe that all songs were exactly a half-hour long.— Brian