Bingo. /Library/Application Support/TechTool Protection/volume_name/ occupies 74.71 GB. The hard drive has 125.28 GB of data, total. I'll wait for MMT3 but if I don't hear anything soon, I'll trash that folder.
Many thanks for the link, Hal.
EDIT: I just contacted Micromat's online support, in case MMT3 doesn't see this thread.
Here's something interesting: The command that you added in an edit comes up:
du -sch {,~}/Library/Application\ Support/TechTool*
70G /Library/Application Support/TechTool Protection
472K /Users/jonathanmchuzi/Library/Application Support/TechTool Pro 5
70G total
I had done a Get Info on both folders previous to seeing your edit but thought that you might be interested in the result. I don't know why the command shows less data in the obese one.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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