I recently obtained a Wallstreet PowerBook G3 on eBay for the express purpose of resurrecting a number of valuable Adobe fonts from floppy disk. That was the last laptop system that had floppy disks. I had thought, I could use the floppy disk drives in Classic while booted into Jaguar, but apparently the floppy disk driver is missing from the Blue Box, too. So, it's a multistep process:
1. Boot into OS 9.
2. Save a disk image (.img) with DiskCopy in OS 9.
3. Boot into OS X Jaguar.
4. Convert the disk image using Disk Copy, which gives it the nowadays familiar .dmg suffix.