![]() ![]() ![]() Big Sur picked up on the system/Data volume division of Catalina, but added another layer: when installed or upgraded, macOS’s system volume has a cryptographic wrapper around it that prevents the slighest modification without detection.Įssentially, a Big Sur system volume has to be installed on a freshly erased disk, because the process of making the seal is unique to each volume. (The Big Sur volume isn’t even mounted directly, but as a read-only APFS snapshot, making it even harder for an attacker to find a way in.)īig Sur took that one step further in a way that affects your ability to continue to make backups of the style you might be accustomed to, and which requires a rethink for the present and future. The system volume is read-only and locked against modification during an active macOS session the Data volume can be read and written, and apps on its may be launched. With the concept of a volume group in APFS, Catalina organized all system files and core apps into one volume and all user-owned and user-modifiable data, third-party apps, and some Apple apps into another. This culminated in macOS 10.15 Catalina in splitting macOS into two pieces, which appear seamlessly as a single unit in the Finder, but which severed a long-time intermingling of files. ![]()
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