![]() ![]() OmniDiskSweeper (free) or DaisyDisk (not free) can analyze your disk and show you where your disk usage is. dmg files that are no longer needed and can be deleted. Sometimes just searching for all files with ".dmg" in their name results in scores of large. (Previously this would only work on a Mojave or High Sierra Mac). Your Data volume should mount UPDATE 2 02/14/21 A new way to mount an Encrypted Mac to a Big Sur or Catalina Device. In fact you will want a good buffer above that for free space since everything the computer does (including the install itself) will be extremely slow if the Mac is operating close to zero or little free space.Ĭommon ways to save disk space: clearing out the Downloads folder, moving photo libraries to an external drive, deleting old and no longer useful iPhone backups and iPhone IOS upgrade files. Open disk utility and right click on Macintosh HD Data and click Show In Finder. While the Big Sur Installer is typically 10-15 GB, it has to be expanded and ultimately as much as 35-40 GB may be required free space. Click once on Macintosh HD and choose File => Get Info to see how much free space there is. (There can be other reasons but free space is the most common one I have seen for this message.) Try emptying the trash and reboot. Probably the most common reason for this is not enough disk space free. ![]()
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