Install Floppy Drive

Choose which drive bay you want to install the drive to and remove the face plate off of that bay. Save the face plate for future use. Pick a bay that will fit the drive. If you have to install a 3.5" drive in a 5.25" bay, you'll have to use a special front panel to adapt it. This panel usually comes with a new floppy drive.
Now, slide the drive into the bay from the front. If your particular case has a drive rack, then you may need to remove the rack from the system and then screw the drive into the rack separately from the actual case. Otherwise, screw the drive into the case itself. Before doing so, make sure the front of the drive is flush with the front of the PC.
If you are using brackets to hold the drive in place, secure them now. You may need to temporarily disconnect the cables. Once in, tighten the drive in place. Double-check the connections, also checking the connections for other drives to make sure you didn't bump one out of place.
Now, the floppy disk drive should be installed properly.
OPTIONAL : If you are installing a 3.5” internal ZIP drive, you install it the same way and into the second floppy drive bay of your case.