Units of Computer Storage & Memory

UNITS: Byte = 1 Character, 8 bits (binary digits), ex. 10110100

KB = Kilobyte =  1024 or 2 to the 10th power.  Kb = kilobit or 1,000 (Thousand) bits.
MB = Megabyte = 1,048,576 or 2 to the 20th power.  Mb = Megabit or 1,000,000 (Million) bits
GB = Gigabyte = 1,073,741,824 or 2 to the 30th power.  Gb = Gigabit or 1,000,000,000 (Billion) bits
TB = Terabyte = 1,099,511,627,776 or 2 to the 40th power.  Tb = Terabit or 1,000,000,000,000 (Trillion) bits
PB = Petabyte =  1,125,899,906,842,624 or 2 to the 50th power.  Pb = Petabit or 1,000,000,000,000,000 (Quadrillion) bits
EB = Exabyte = 1,152,921,504,606,846,976 or 2 to the 60th power.  Eb = Exabit or 1,000,000,000,000,000,000 (Quintillion) bits
ZB = Zettabyte = 2 to the 70th power.  Zb = Zettabit or 1,000,000,000,000,000,000,000 (Sextillion) bits
YB = Yottabyte = 2 to the 80th power.  Yb = Yottabit or 1,000,000,000,000,000,000,000,000 (Septillion) bits
EXAMPLES OF STORAGE MEDIA AND THEIR SIZE
3.5 inch HD diskette  1.44 MB Big Novel: War & Peace
Standard CD 650-700 MB  Encyclopedia
DVD     17 GB  Small town library
HD-ROM    165 GB  10 Full-length movies +
Hard Disk    1-5 TB  All the text in Burlington's Fletcher Free library
Zoo's Hard Disk Array  ~100.0 TB One Hundred times all the printed text in Bailey Howe library +
Zoo's backup tape drive 50 Peta Bytes >500 Bailey Howe Librarys

Link to another table of examples of how many bytes for information: http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci944596,00.html