I just ran through all of my 5" 20MB Bernoulli Box cartridges and a lot of them would not format using the Iomega tools. The media itself looks fine, but it might be worn out or magnetically compromised. This media uses servo information that I don't think can be written by the drive. So bulk erasing to try to clear up errors is out of the question. I tried it just for grins and what was a marginal disk now never comes ready. Aside from making sure the drive and heads are clean, is there anything else to be done with these? (In the event that they are dead, I'm looking for ideas for an art project using them. ;-) ) Mike