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Apple File System was announced at Apple's developers’ conference (WWDC) in June 2016 as a replacement for HFS+, which had been in use since 1998. [11] [12] APFS was released for 64-bit iOS devices on March 27, 2017, with the release of iOS 10.3, and for macOS devices on September 25, 2017, with the release of macOS 10.13.
Reliance Nitro – Tree-based transactional, copy-on-write file system developed for high-performance embedded systems, from Datalight (Acquired by Tuxera in 2019) [7] RFS – Native filesystem for RTEMS [8] SkyFS – Developed for SkyOS to replace BFS as the operating system's main file system. It is based on BFS, but contains many new features.
Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.
Copy on write Trim support OS support. File system DOS Linux ... OS/2 BeOS Minix Solaris z/OS Android [68] APFS: No Partial (read-only with apfs-fuse [69] or linux ...
Thanks to the copy-on-write nature of Btrfs, the original versions of the file data blocks are preserved during all file modifications. Until the conversion becomes permanent, only the blocks that were marked as free in ext2/3/4 are used to hold new Btrfs modifications, meaning that the conversion can be undone at any time (although doing so ...
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Full copy-on-write file systems (such as ZFS and Btrfs) avoid in-place changes to file data by writing out the data in newly allocated blocks, followed by updated metadata that would point to the new data and disown the old, followed by metadata pointing to that, and so on up to the superblock, or the root of the file system hierarchy. This has ...
APFS – Apple File System; ASM – Automatic Storage Management – Oracle's database-oriented file system; BFS – BeOS, Zeta and Haiku operating systems; Btrfs – Extent-based copy-on-write (COW) file system for Linux; EFS – Extent File System – SGI's first-generation file system for IRIX