Tom, my guess is that TetrisMaster512 is referring to the voodoo that occurs when a cartridge formatted using the Iomega 4.2 driver is used in a Mac with a later version of Iomegaware installed.

Click to expand...

And by "voodoo" I assume you are referring to the behavior of later Iomega INITs in the system file automatically updating an older disk driver to that of the INIT (assuming like Apple that the latest version is always better without regard for use). Not sure why one would format an Iomage formatted drive with LaCie's Silverlining though. As far as I know they are mutually exclusive.

However, this is a moot issue for all but the Mac Plus. The Classic can use the latest Iomega INIT supported by the Classic. However, if one wants to preserve Mac Plus ZIP boot capability, then 4.2 is the only INIT to use.

You are much too modest not including your own links to your solutions.

http://www.vintagemacworld.com/pluszip.html

and of course this one:

http://www.mac128.com/zip.html