Managing Xcode Downloads
Now that you know what Xcode is using, you’ll wonder where it’s getting the disk image. It’s located in a sibling directory: /Library/Developer/CoreSimulator/Images. That folder also contains an images.plist file that contains metadata for the disk images. There are only a handful of files there, but on my Mac they use 13 GB of disk space.
And up until a couple of hours ago, that folder contained 7 GB of data that was incompatible with the current version of Xcode. I had to delete these files manually.
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In the end, this short post saved me 32 GB of disk space. If you’re developing for platforms other than the current iOS, you’ll likely see something similar. As time passes, you’ll need to manually keep an eye on this stuff: Xcode can’t clean things up for you because it has no idea what you need.
The excellent DevCleaner is able to detect this, and offer keeping only the latest platform versions' runtimes: https://apps.apple.com/us/app/devcleaner-for-xcode/id1388020431?mt=12