ZB ( Zettabyte )

A combination of the Greek "zeta," the second last letter of the Greek alphabet (omega is the last letter), and the English "bite," meaning "a small amount of food." A unit of measurement for physical data storage on some form of storage device — hard disk, optical disk, RAM memory etc. and equal to two raised to the 70th power, i.e. 1,180,591,620,717,400,000,000 bytes.

KB = Kilobyte (2 to the 10th power)

MB = Megabyte (2 to the 20th power)

GB = Gigabyte (2 to the 30th power)

TB = Terabyte (2 to the 40th power)

PB = Petabyte (2 to the 50th power)

EB = Exabyte (2 to the 60th power)

ZB = Zettabyte (2 to the 70th power)

YB = Yottabyte (2 to the 80th power)

One googolbyte equals 2 to the 100th power.