But did you send your editors hard copy printouts and a 3.5-inch floppy copy back in the 90's, or was it on a CD-R?
^ I never turned anything in on a CD, nor did authors turn things to me on CD back then.
A CD would be a fairly impractical way to transfer it, anyway. Remember the file sizes we're talking about, here - even now, full-length books in .doc format just aren't that big. A 3.5" floppy, at 1.44MB, is plenty to hold the file. A 700MB CD would be massive overkill - it would have been wasteful of the more expensive media to put a book on there and ship it off that way. Maybe if you wanted to send your editor a mixtape along with it, but otherwise a floppy makes much more sense.