Make sure the Mac-PC Manager is in the Control Panels folder and is controlling the drive. See if you can mount a Mac disk. If you can, then click once on the icon for the Mac cartridge and hit CMND-I (Get Info) look in the "Where" field, it should show you what driver is controlling the device right after the SCSI ID number.
Zip and Jaz drives are controlled by the Iomega Driver extension. Turn this off, but don't trash it since Iomega Tools requires their own driver. You'll need to turn Iomega Driver back on and restart to use the Tools.
FormatterFive only supports SCSI and ATAPI drives. It doesn't support IDE Zip drives in G3 machines or magneto-optical drives in PowerBook expansion bays.
In the finder, choose "Special" and select "Erase Disk" there will now be an option for "Mac or DOS" just select DOS and format just as you would a Mac floppy.
Zip and Jaz drives are controlled by the Iomega Driver extension. Turn this off, but don't trash it since Iomega Tools requires their own driver. You'll need to turn Iomega Driver back on and restart to use the Tools.
It takes between 5 to 10 minutes per 100 megabytes (mostly depends on the speed of the drive, but new drives format much quicker) a 2 gig drive will take between one and a half to three hours (or so) to format it. Of course you really seldom need to format a disk. Just "Installing" a partition on it is usually enough to make it ready for use. Most disks come pre-low level formatted from the factory and don't need to be re-low level formatted the second you take it out of the box.
This means that there was already a driver preloaded at startup. Usually this means that there is either another extension that is getting control of the drive or that there is a disk in the drive and it already has its own driver. If it already has a driver written on the drive then you may want to make sure that this driver is an updated one. If the SCSI ID for that drive shows that the drive is an internal Mac drive then that is ok - your startup drive and internal Mac drives have their own drivers stored on them so that you can boot off of them.
No, FormatterFive only supports block-addressable, writable drives. It will not help mount CD-ROM's.
There is no such thing as a DOS CD-ROM. The CD-ROM's for the IBM PC use an ISO 9660 layout, and this layout is recognized by most CD-ROM extensions. This does not mean that DOS applications can be run from an ISO 9660 CD-ROM, the files will just be accessible.
ISO 9660 does not support Windows 95 long filenames so Microsoft wrote an expansion to it named Joliet. Apple's Foreign File Access extension does not yet recognize Microsoft's expansion so Macs can only read eight character names on CD-ROM.