Apple Macintosh Performa 6400 Series - Manual (Page 57)

Expanding memory
For information on increasing your computer’s memory, see Appendix B,
“Installing Additional Memory.”
Replacing or adding internal storage devices
Your Macintosh comes with three internal storage devices—a floppy disk
drive, a CD-ROM (compact disc read-only memory) drive, and a hard disk
drive (several capacities are available). If you want to replace any of these
internal drives, see your Apple-authorized dealer.
Your computer also has an expansion bay—just behind the front panel, above
the CD-ROM drive—for an additional, optional 5.25-inch storage device
(1.7 inches high). Examples of storage devices include a second CD-ROM
drive, a tape storage backup system, or a second internal hard disk. If you
want to install another storage device inside your computer, see your Apple-
authorized dealer.
57 Connecting Equipment and Expanding Your Computer