Instead, it creates a new file that uses all of the original file’s disk blocks for storage. This is because it’s not actually copying all the data to a new set of disk blocks. As you may have noticed, duplicating a file in APFS using the Finder completes almost instantly, regardless of it’s size. One of the most obvious is APFS’s ability to perform quick copies of files. These technologies (reference counting and copy-on-write) allow an operating system to do many useful things. When a disk block is shared by multiple files and one tries to write to the block, it is duplicated (and the file’s internal data updated to reflect that it is now using a different block) before the write operation. This is used in conjunction with “ copy-on-write” technology. There is a per-block reference count stored, so that when files are deleted, the block isn’t freed until all of the files using the block have been deleted. The general idea is that, when using a snapshot-capable file system, each disk block can belong to multiple files. Here’s a white paper that, in part, explains their implementation. The earliest example I’m personally familiar with was developed by NetApp for their file server appliances. Various kinds of network servers have been using them for decades. Snapshots are nothing new to the industry. #1605: OS updates with security and bug fixes, April Fools article retrospective, Audio Hijack 4, 5G home Internetĭisk Utility in macOS 12 Monterey Manages APFS Snapshots.#1606: Apple's self-sabotaging App Store policies, edit Slack messages easily, WWDC 2022 dates.#1607: TidBITS 32nd anniversary, moving from 1Password to KeePass, pasting plain text, Mail fixes anchor links, RIP Eolake.
DISK UTILITY APPLE DISK IMAGE MEDIA HOW TO
#1609: Apple Q2 2022 results, Apple's Self Service Repair program launches, escaping the cloud with a Synology NAS.
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