Odd, you can put a standard 2.5 inch notebook hard drive in there. Would it be possible that it is IDE with pins switched around, sounds like a waste to have multiple interfaces in there.

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You seem to be assuming that the use of an IDE hard drive somehow implies that the floppy interface is also IDE. I don't know why you would make that association -- it would be unique among computers if it were so. A scsi-equipped mac does not have a scsi floppy drive; PCs with IDE hard drives have proprietary floppy interfaces that, although sharing a common heritage with IDE, are not themselves IDE.

Floppy and hard drives have very different characteristics, and their interfaces evolved independently as a result.

And no, the 150's floppy interface is not just an IDE with "pins switched around." I really meant what I wrote earlier: The floppy interface in a Mac is nowhere near IDE in design.