These are used to connect computer to external peripheral devices like printers and scanners. Buyers should purchase computer hardware from a reliable source at reasonable prices. Sometimes computer hardware includes some removable media writers such as CD, CD-ROM Drive, CD Writer, DVD, DVD-ROM Drive, DVD writer, DVD-RAM Drive, Floppy disk and Zip drive. They can also find useful information about computer hardware on Internet. These can be assembled on the motherboard or expansion card directly.