I've had more problems with FDDs and Media than with Zip Drives and media for the last eight or nine years, not the least of which is that a 1.44MB FD doesn't usually hold enough data to waste an I/O bay upon given any other option, especially one for removable media.
I pretty much cut the FDD cable in the Duo era. I had the external FDD from the PB100, but carried a Zip Drive in the bag if I didn't want to carry both. I made the jump to '030 and then PPC level applications with the used 230 and then a refurb 2300c, so I never had a PB with FDD until resurrecting a DOA 190 I'd picked up that was slated for other things. The first post-Duo PB was Beater, my maxed out 1400c/G3 WiFi RoadWarrior and I'm not sure if I ever even used the FDD for anything but the occasional software install.
If I need to use a floppy in any new acquisition, I test the drive first with a sacrificial floppy. There's no need to do this if a Zip has been attached or is already on board, I
copy that floppy to a Hard drive on a known good system (the pet IIfx or 6360) and use Zip from then on.
I use the "internal CD" of the pet IIfx a lot more than the FDD and I need to pop the hood to do that. For anything but the evil 8500 and 840AV cases, it'd be easier to open the case up and hook up an FDD if I ever needed one. For the 6100, that's a no-brainer as far as I'm concerned.
I'd lopped off the blank bezel section of the borked case 6100 just before making the Zip->FDD Conversion suggestion to uni last night. Hacking a door that opens up to access a bay for general use just to keep a relic housed behind a 3.5" opening makes ZERO sense to me if I've got an internal Zip Drive available . . .
. . . or even an external drive, apparently . . .
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