A yottabyte is the largest unit of computer storage among currently used computer storage units.
As of February 2012, no computer could store as much information as this storage unit. In fact, according to a study conducted in 2008, the total storage space of all computers in the world is around 486 exabytes.
According to the projection, the total of storage areas will reach one zettabyte in 2010.
It is equal to 9671406556917030000000000 bits.