Lexington School District One

8 bits = 1 byte (1 bit is the smallest measurement.)

A Kilobyte (KB) is 1 thousand bytes or characters (or 1,024 bytes more precisely).

A Megabyte (MB) is 1 million bytes (or 1,024,000 bytes; 1,024 kilobytes).

A Gigabyte (GB) is 1 billion bytes of information (or 1,024 megabytes).

A 3 1/2" floppy diskette holds 1.4 MB (megabytes) of information.

Storage capacity of a CD (Compact Disc) is approximately 680 MB.
If it's an audio CD, is holds approximately 74 minutes of audio sound.
(That's a complete rendition of Beethoven's 9th Symphony--the "magic" work for CD designers.)

A DVD (Digital Versatile Disc or Digital Video Disc) holds approximately 4.7 GB (Gigabytes) of information.

Zip disks come in 100MB, 250MB and 750MB varieties.
They are used to back up data or transfer data from one computer to another.

Your computer's hard drive most likely holds more than any of these.

Additional Storage Devices

USB Keychain - A USB portable storage device small enough to fit on your keychain or clip onto your shirt pocket. They come in various capacities to fit your data needs (available from 8MB to 2GB).
http://www.lehigh.edu/helpdesk/faq/qa/keychain.shtml
http://www.m-sys.com/content/Markets/usb_keychain.asp

Flash Memory

Memory Stick - (Developed by Sony) The memory stick is an optional way to share and transfer pictures, sound, and other data between different compact electronic devices such as digital cameras and camcorders. It has up to 10 times the storage capacity of a 3.5 diskette - available in 4mb, 8mb, 16mb, 32mb, and 64mb sizes.
http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci214628,00.html

CompactFlash (most often found in digital cameras)
SmartMedia (most often found in digital cameras)
PCMCIA Type I and Type II memory cards (used as solid-state disks in laptops)
Memory cards for video game consoles
Read more about Flash Memory and the above examples:
http://computer.howstuffworks.com/flash-memory.htm