![]() To give OmniDiskSweeper full access to all files on your drive, you must run the application from the Terminal using the sudo command, which stands for “Super User Do” and gives access to all files on a user’s drive. Since few people ever run as a fully priviledged “root” user, this means you’re almost always going to miss something, including system-level files or files and folders belonging to other user accounts on that Mac. When run normally, as above, Joe noted that OmniDiskSweeper only shows files that are visible to the user that ran it. ![]() Note also the size of the Spotlight Database as 0 bytes. It shows that the user’s Documents folder is the largest folder on the drive. ![]() OmniDiskSweeper run from the Applications folder. Thankfully he also found a solution which he shared with us and we now share with you. This allows a user to easily find the largest files on a drive and is great for clearing up free space (such as when preparing to migrate to a smaller solid state drive). However, in Mac Geek Gab 355, listener Joe found that it doesn’t always show everything. OmniDiskSweeper scans the files and folders of your Mac’s hard drive and displays a list, in order of file size, of the contents of your drive. By the time that we reach 13.6 next summer, even that 40 GB disk with 22 GB of free space in 13.0 could well have lost sufficient free space to make further updates tight for free space.Long time Mac Geek Gab listeners know that using OmniDiskSweeper is a fantastic (free!) way to find out what files are taking up all your precious hard drive or SSD space. Once happily running macOS 13.1, free space was around 0.5 GB less than it had been in 13.0. Updating to 13.1 also has a long-term cost in terms of free space. To have any degree of comfort, make that a 40 GB disk with at least 20 GB free. In practice, even for the modest needs of a basic Ventura 13.0 installation in a VM, the smallest disk size you’ll be able to update from 13.0 to 13.1 is 33 GB, providing at least 14 GB of free space. So depending on when you run it, the installer might claim it needs 12.97 GB, 13.22 GB, or 13.56 GB of free disk space, but really wants around 14 GB. I was reminded of it when TidBITS reader Marc Heusser wrote to tell us that upgrading from macOS 12.6.1 Monterey to macOS 13.0.1 Ventura on an M1 MacBook Pro with insufficient free space resulted in errors that prevented the MacBook Pro from booting. For work, I need to run the Microsoft OneDrive client on one of my Macs, and I was surprised to see that it recently crossed the 1 GB threshold. Users are disrespected by increasing and surprising bloat in applications. Check Free Space Before Updating to Big Sur.diskspace Tool to Report APFS Free Space.These days I find that I want about 150 GB for a test partition that will include macOS, Xcode, and enough space to clone my Git repo and run the tests. Given that drives can be a terabyte in size, this doesn’t seem wildly inappropriate however, many organizations still buy devices with 256GB drives (thus going from an eighth in the 64GB drive era to a quarter of common drive space required to be free for certain upgrades on smaller drives today). Therefore, scoping policies to run an updater without causing undo issues to end users it’s entirely appropriate to make sure they have the amounts of free space indicated per version. The net result is that when doing the last few upgrades, they have required 12+GB for the installer itself (which can be run from a USB drive) and up to 44GB for the installer to do the work it needs to do, so a total of up to about 56GB. This was 2016 and the amount of free space required to do an upgrade would increase dramatically. Sierra (Mac OS X 10.12) had a minimum drive capacity of 8.8 GB but really needed more like 12 GB however there wasn’t a hard number sanity check that I personally ran into. Free Space Required for Modern macOS Upgrades
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