OP:
Do you have the ZIP drive connected?
If so, are any lights on (on the drive, WITHOUT a disk inserted into it)?
What happens when you insert a ZIP disk?
Does it spin up? (even if it doesn't mount on the desktop)
Answer these questions -- ALL of them.
Then we can go forward...
Connect the ZIP drive and put a disk into it. Let it spin up, even if it doesn't mount on the desktop.
Open disk utility.
VERY IMPORTANT: In the view menu, choose "show all devices".
Can you see the ZIP drive "on the left" now?
It works just fine on my iMac and MacBook Air running Catalina 10.15.5 as well as all my other Macs including my G4 and PowerMac 7200.I followed the above instructions - the Iomega drive does NOT appear in the sidebar.
Wow, a Zip drive... talk about a blast from the past! Can't believe they still work today.
"How are people hooking them up to a newer Mac ?"
Via USB, of course...
(later ZIPs did come with a USB connector)
I am running Sierra 10.12 and mine still works.I have some old files I need to get some zip disk, but my zip drive does not seem to operate with OS 10.14. Does anyone know of a solution?
I followed your procedure exactly, with the same result. The ZIP100 disk in the drive will not mount and the same error message appears."When I connect the drive to the MacBook, any disc that is inserted appears in Disk Utility but is grayed out and cannot be mounted or erased. When I try to mount, a message appears that includes disk error 49153."
I don't know if this will help, but try it in the EXACT ORDER presented:
1. power down, all the way off
2. connect the ZIP drive and insert a disk (it won't spin yet, but insert it anyway)
3. power on the MacBook
4. log in and get to the finder
Does the ZIP disk mount on the desktop now?
Or... same error msg?