SNIA Online Dictionary

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ZB / ZByte	[General] Shorthand for Zettabyte.
Zbit	[General] Shorthand for Zettabit.
Zebibit	[General] Shorthand for 1,180,591,620,717,411,303,424 (270) bits. Binary notation is most commonly used for semiconductor memory sizes. See also Zettabit.
Zebibyte	[General] Shorthand for 1,180,591,620,717,411,303,424 (270) bytes. Binary notation is most commonly used for semiconductor memory sizes. See also Zettabyte.
zero filling	[Data Security] The process of filling unused storage locations in an information system with the value of 0.
zero-day vulnerability	[Data Security] A previously unknown vulnerability to the vendor that may or may not have been exploited by malware.
zeroing	[File System] The process of writing zeroes (0x00) to all the bytes in a block or an entire disk before delivering it for use, or upon its release from use. Zeroing renders any data formerly stored on the block or device inaccessible except by forensic means such as magnetic force microscopy and other techniques that physically scan the storage media.
Zettabit	[General] Shorthand for 1,000,000,000,000,000,000,000 (1021) bits. The SNIA uses the base 10 convention commonly found in I/O-related and scientific literature rather than the base 2 convention (1,180,591,620,717,411,303,424, i.e., 270) common in computer system and software literature. See also Zebibit.
Zettabyte	[General] Shorthand for 1,000,000,000,000,000,000,000 (1021) bytes. The SNIA uses the base 10 convention commonly found in I/O-related and scientific literature rather than the base 2 convention (1,180,591,620,717,411,303,424, i.e., 270) common in computer system and software literature. See also Zebibyte.
ZiB / ZiByte	[General] Shorthand for Zebibyte.
Zibit	[General] Shorthand for Zebibit.
zone	[Fibre Channel], [Storage System] [Storage System] A group of sectors on an HDD that uses SMR that must be written sequentially. [Fibre Channel] A collection of Fibre Channel N_Ports and/or NL_Ports (i.e., device ports) that are permitted to communicate with each other via the Fibre Channel Fabric.
Zone Set	[Fibre Channel] A set of zone definitions for a Fibre Channel Fabric. Zones in a zone set may overlap (i.e., a port may be a member of more than one zone). Fibre Channel Fabric management may support switching between zone sets to enforce different access restrictions (e.g., at different times of day).
zoning	[Fibre Channel] A method of subdividing a storage area network into disjoint zones, or subsets of nodes on the network. Storage area network nodes outside a zone, except those with well-known addresses, are invisible to nodes within the zone.