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Message: [QUOTE="honestone, post: 1543901, member: 17069"] Onyx is available for free from here: [URL]http://www.titanium.free.fr/onyx.html[/URL] The version one would download depends upon the Mac OS they are using. Disk Utility is Apple software, comes as part of the OS, and is located in the Utilities folder, which is inside the Applications folder. Techtool Pro is a commercial (ie, costs money) program available here: [URL]http://www.micromat.com/[/URL] I don't know what "TIA" is. Regarding Sierra, prior to upgrading (I suspect you did that "in place"), did you insure that any third party software you have (including Parallels) was/is compatible with OS 10.12.x? That is critical. [/QUOTE]