As a side note for those interested in digital data destruction, and analogous to the above, I also understand that it's probably not worth the time/effort to wipe a hard-disk using gov-mil-spec procedure to write zeros/ones with 3 passes when it's going to disposal or transferred to other peoples.

They mostly break from putting credit cards (or disks) through, but they can break just after a couple years of paper-shredding use too.

Bought this shredder recently mainly to shred several hundred CD/DVDs accumulated over years of backup data and hard-disks image files

the CD/DVD disc shredder a passable job at data destruction when it cut the disk in half and scratched the disk in a few areas.

I'm using a piece of scrap paper on which I've drawn big lazy S's across the paper with 3-in-one oil.