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== Copy-on-write in storage media ==
COW may also be used as the underlying mechanism for disk storage [[Snapshot (computer storage)|snapshots]] such as those provided by [[logical volume management]], Microsoft [[Shadow Copy|Volume Shadow Copy Service]] or file systems such as [[btrfs]] in [[Linux]].
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The copy-on-write technique can be used to emulate a read-write storage on media that require [[wear leveling]] or are physically [[write once read many]].
The [[qcow2]] (QEMU copy on write) file format for disk images uses the copy-on-write principle to delay allocation of storage until it is actually needed. This reduces the actual disk space required to store disk images.
Some [[Live CD]]s (and [[Live USB]]s) use copy-on-write techniques to give the impression of being able to add and delete files in any directory,
without actually making any changes to the CD (or USB flash drive).
==Other applications of copy-on-write==
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