interesting file shredding problem/solution

I had been shredding my files using random numbers. Then Windows started acting a bit erratic. I determined that the random numbers, in conjunction with error correction, would occasionally read a random block into one or any of the other files. I used a shredder that wrote entirely 0's to the drive and the problem disappeared.

 

Makes sense. Just by coincidence, some of the random numbers just happened to match something that appeared to be actual data. When I shred, I use zeroes all the way thru....