I wrote the zip review thing, and I really think the issue was with what Poseidon is trying to do. The zipdisk falls under the catagory of "Mass Storage Device," which has some default settings geared towards reading PC formatted hardware.
I'm sure it could be changed, but when those settings are changed, it is universal (AFAIK). This is for the Mass Storage Device in Poseidon, and would likely hold true for real os3.x Amigas as well. I don't think it is a bug in Posiedon either, but a choice that had to be made. To my understanding regular (IDE or SCSI) zip drives should work on a Pegasos with MorphOS as they would under a native Amiga.
