The zebibyte is a multiple of the unit byte for digital information. It is a member of the set of units with binary prefixes defined by the International Electrotechnical Commission (IEC). Its unit symbol is ZiB.

Multiples of bytes
Value Metric
1000 kBkilobyte
10002 MBmegabyte
10003 GBgigabyte
10004 TBterabyte
10005 PBpetabyte
10006 EBexabyte
10007 ZBzettabyte
10008 YByottabyte
1024 KiBkibibyte KBkilobyte
10242 MiBmebibyte MBmegabyte
10243 GiBgibibyte GBgigabyte
10244 TiBtebibyte
10245 PiBpebibyte
10246 EiBexbibyte
10247 ZiBzebibyte
10248 YiByobibyte

The prefix zebi (symbol Zi) represents multiplication by 10247, therefore:

1 zebibyte = 270 bytes = 1180591620717411303424bytes = 1024 exbibytes

The prefix zebi was added to the system of binary prefixes in August 2005.[1]

One zebibyte (1 ZiB) is equal to eight zebibits (8 Zibit).

One thousand twenty-four zebibytes (1024 ZiB) is equal to one yobibyte (1 YiB).

Usage examples

  • GUID Partition Table (GPT) allows for a maximum disk and partition size of 8 zebibytes, or 9.4 zettabytes, when using 512-byte sectors.[2][3]
  • The ZFS filesystem has a theoretical volume size limit of about 256 quadrillion zebibytes.[4]

In late 2017, commercial internal hard drives for the consumer PC market were available up to about 10 to 12 TB (as single drives, multiple drive arrays with higher total capacity are also available, generally as external devices). The available information storage of 1 ZiB is therefore equivalent to approximately 100 million of the largest hard drives available on consumer PCs.

See also


  1. News & views from the IEC June 2012
  2. "FAQ: Drive Partition Limits" (PDF). UEFI Forum. 2010-06-09. Retrieved 2013-05-29.
  3. Roderick W. Smith (2012-07-03). "Make the most of large drives with GPT and Linux". IBM. Retrieved 2013-05-29. Disk pointers are 64 bits in size, meaning that GPT can handle disks of up to 512 x 264 bytes (8 zebibytes, or 8.6 billion TiB), assuming 512-byte sectors.
  4. "Oracle Solaris ZFS Administration Guide". Oracle Corporation. Retrieved July 27, 2013.
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