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 Optical Discs Use laser technology to read and write data on silver platters. Compact Disk (CD) can store 650MB to 800MB of information and data. CD-ROM (Read Only Memory) can only read data from a CD-ROM. You can store data on a CD only if you have a CD Burner and CD-R (writable) or CD-RW (rewritable) CD.  Digital Versatile Disk (DVD) Digital Versatile Disk (DVD) is the size of a regular CD and can be played in a regular DVD movie player. DVD can store 4.8GB to 8.0GB of information and data. DVD-ROM is readable only (a movie DVD). You can store data on a DVD only if you have a DVD Burner and DVD+R/DVD-R (Writable) or DVD-RW (rewritable) DVD. Pen Drive USB (Universal Serial Bus) Pen Drive is a compact secondary storage device. It is also known as a USB flash drive, thumb drive or a jump drive. It connects to a computer via a USB port. It is commonly used to store and transferrer data between computers. SD Card SD Card stands for Secure Digital Card. It is most often used in portable a