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Another technology behind DVD CD drives is that they use a low powered laser to read data that has been digitized and encoded into a DVD disk in form of tiny dots. They can be used to play a variety of DVD formats. Some of these formats include DVD-R and DVD/ -RW drive which are endorsed by DVD Forum. Another competing technology uses plus sign in their models and which can also be supported by most DVD drives. These models use DVD+R, DVD+RW. Installing CD/DVDs drives to a computer is something that anyone can do with ease. A do it yourself user guide comes with the CD/DVD drives themselves and shows step by step guide to its installation. However, one important thing that one should do during the installation is to make sure the power is switched off. By carefully reading the user guide, one can avoid waste of time and resources. The Integrated Drive Electronics (IDE) cable is used to attach the CD/DVD drives to the computer system. This cable also acts as a drive controller and therefore, the need for a separate controller connected on the motherboard is covered. The IDE cable uses a simple command interface which can be compatible in many computer systems. No software or DVD driver whatsoever is needed to control the IDE cable. Its full use came into being in 1994 when it was fully standardized. Most of these cables can support more than one drive in a computer system. DVD drives can be simply a DVD ROM or a DVD writer (DVD / -RW drive). A DVD ROM only reads DVD files while a DVD RW Drive on the other hand can read and record data on a CD or DVD disk. A DVD writer can therefore write or even overwrite on any blank DVD disk. A DVD writer can either be attached internally using an IDE cable or it can be attached to a computer using a universal series bus cable.