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The software update process is optimized.The system volume containing the core operating system is cryptographically signed.Spotlight becomes the default search mechanism in Safari, Pages, and Keynote.The APFS's snapshot technology is added to Time Machine, improving the backup speed.Support running iOS and iPadOS applications without any modifications.Support ARM64-based processors for the first time.Control Center is added to the menu bar, offering quick toggles for Wi-Fi, Bluetooth, screen brightness, and system volume.The user interface is redesigned, featuring the translucency in various places, a new abstract wallpaper, a new color palette, rounded-square icons, etc.It is the successor to macOS Catalina and was succeeded by macOS Monterey released in 2021. Released in 2020, macOS Big Sur (version 11) is the seventeenth major release of macOS. Do you want to reinstall macOS Big Sur on your device? This post from MiniTool Partition Wizard offers you the macOS Big Sur download and install guide. Try making a fresh table, and using Parted's rescue feature to recover partitions.Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes.All these warnings are safe to ignore, and your drive should be able to boot without any problems.Refer to the following message from Ubuntu's mailing list if you want to learn more.MacOS Big Sur was released in 2020 and succeeded by macOS Monterey in 2021. Is this a GPT partition table? Both the primary and backup GPT tables are corrupt. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Perhaps it was corrupted - possibly by a program that doesn't understand GPT partition tables. However, it does not have a valid fake msdos partition table, as it should. Ubuntu images (and potentially some other related GNU/Linux distributions) have a peculiar format that allows the image to boot without any further modification from both CDs and USB drives.A consequence of this enhancement is that some programs, like parted get confused about the drive's format and partition table, printing warnings such as:/dev/xxx contains GPT signatures, indicating that it has a GPT table.