In this ProductWatch report, we evaluate several different types of media based on these criteria, and rate them according to our long-term experiences Iomega Zip and Jaz drives are popular choices due to their wide availability. Despite a relatively high cost per megabyte compared to a standard hard drive, these drives are particularly popular with users in the DTP and graphics businesses. However, a large number of people have reported problems with Jaz cartridges and drives. Of the twenty or so drives we used, over half failed. Iomega confirms that Jaz drives have problems with disk defragmenting and disk repair tools, at least on the Macintosh, when using Iomega drivers.
Further details are here .
It's also worth mentioning that Iomega has offered both 1GB and 2GB versions of its Jaz drive, so be sure you know what you're buying if the price seems too good to be true. We have several Epson MO drive mechanisms that have been in service just as long, but not been a problem. Unfortunately, the broken drives are virtually unfixable. On a positive note, MO disks appear to be extremely resilient to damage. They are not subject to corruption from the earth's magnetic field or local magnetic disturbances, and the disks are widely available.