5.25-inch Drive Bay

CD-ROM Drive

5.25-inch external drive bays can hold several different types of hardware. A CD-ROM drive, like the one shown above, is just one example. CD-ROMs hold around 700MBs, (or 700,000,000 bytes), of information. The data transfer speed rating associated with CD-ROM drives varies up to 56x. For each 1x that a CD-ROM is rated, it can transfer 150KBs of information in one second. For example: a 10x CD-ROM can transfer 1,500KBs of information per second. A 20x CD-ROM can transfer 3,000KBs of information per second. It is simply a standard used in order to be able to rate the speed of CD-ROM drives.