I have dozens of the 200mb and some 88 & 44mb disks. Never had a failure. Used them a lot until bout 10 years ago. Pulled them out last year and tried all of them. They all worked. All my MO disks worked. About half my zip disks died.

Jaz drives were Iomega. I used to have those fail regularly. They were replaced under warranty but the data was still gone. Plus you had to pay the shipping to them.