Step 1	First, select which drive bay will be used for the floppy drive. Remove the faceplate of that bay. Save the faceplate for future use. The two bays to be chosen from are a 3.5" and a 5.25" bay. Be sure to choose the correct bay for the floppy drive that is being attached. To mount a 3.5" drive into a 5.25" bay, a special bracket may be needed that usually comes with the new floppy drive.
Step 2	Without connecting anything yet, insert the drive into the chosen bay, making sure it fits properly.
Step 3	Select the right size screws (preferably those that came with the drive). If using brackets to hold the drive in place, secure them now, or simply use the screws to attach the drive to the bay. First, tighten the screws by hand, and then use a screwdriver to secure the screws. Make sure they are not too tight, and take care not to cross thread or strip the screws.
Step 4	Attach the power and ribbon cable to the drive. If other drives are to be installed, this step can be skipped. This provides more maneuvering room in the case, especially if there are no removable drive bays. The drive cable and power cord can then be connected after all of the drives have been installed.
Step 5	Check the work.