Editing Universally unique identifier (section)

=== Filesystems ===

Significant uses include [[ext2]]/[[ext3]]/[[ext4]] filesystem userspace tools ([[e2fsprogs]] uses libuuid provided by [[util-linux]]), [[Logical Volume Manager (Linux)|LVM]], [[LUKS]] encrypted partitions, [[GNOME]], [[KDE]], and [[macOS]],<ref>[https://opensource.apple.com/source/Libc/Libc-391/uuid/uuidsrc/gen_uuid.c gen_uuid.c in Apple's Libc-391, corresponding to Mac OS X 10.4]</ref> most of which are derived from the original implementation by [[Theodore Ts'o]].<ref name="e2fsprogs">{{cite web|url=https://git.kernel.org/?p=fs/ext2/e2fsprogs.git;a=blob;f=lib/uuid/gen_uuid.c;hb=1bbfec624c4bbe767060a13762aa9a656536a4fd|title=ext2/e2fsprogs.git - Ext2/3/4 filesystem userspace utilities|website=Kernel.org|access-date=9 January 2017}}</ref>
The "partition label" and the "partition UUID" are both stored in the [[Superblock (file system)|superblock]]. They are both part of the file system rather than of the partition. For example, ext2–4 contain a UUID, while NTFS or FAT32 do not. The superblock is a part of the file system, thus fully contained within the partition, hence doing {{code|1=dd if=/dev/sda1 of=/dev/sdb1}} leaves both sda1 and sdb1 with the same label and UUID.