Zettabyte

The zettabyte is a multiple of the unit byte for digital information. The prefix zetta indicates multiplication by the seventh power of 1000 or 10²¹ in the International System of Units (SI). A zettabyte is one sextillion (one long scale trilliard) bytes. The unit symbol is ZB.

A related unit, the zebibyte (ZiB), using a binary prefix, is equal to 1024⁷bytes.

Usage examples

GUID Partition Table (GPT) allows for a maximum disk and partition size of 7.02 zettabytes, or 5.946 zebibytes, when using 512-byte sectors.

ZFS allows for a maximum storage capacity of 256 quadrillion zettabytes.

Comparisons for scale

The combined space of all computer hard drives in the world was estimated at approximately 160 exabytes in 2006. As of 2009, the entire World Wide Web was estimated to contain close to 500 exabytes. This is one half zettabyte. This has increased rapidly however, as Seagate Technology reported selling a total capacity of 330 exabytes of hard drives during the 2011 Fiscal Year.

In 2013, one expert estimated that the amount of data generated worldwide would reach 4 zettabytes by the end of that year.

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Zettabyte

Usage examples

Comparisons for scale

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