AppleCare Document: 24613 Question 3: Why aren't both expansion bays the same size?



Answer: The 5.25-inch expansion bay on the right side of the computer can accommodate either 5.25-inch or 3.5-inch devices. There is a small door that folds back when you insert a 5.25-inch module, such as a CD-ROM drive. The left bay can accommodate only 3.5-inch modules, such as a battery or a floppy disk drive.