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10.7: Restore Apple Hardware Test boot mode
Authored by: Sven G on Feb 13, '14 12:31:53AM

On newer Macs (which shipped with Mavericks), Apple Diagnostics initially is on the Recovery HD; so, after mounting it with:

$ diskutil mount Recovery\ HD

... Apple Diagnostics is in the folder:

/Volumes/Recovery\ HD/com.apple.recovery.boot/.diagnostics

So, the best thing to do would be to make a copy of this invisible folder (personally, I zipped it and stored it on an external hard drive), in order to be able to restore it if you reinstall OS X (which also updates the recovery partition, removing the ".diagnostics" folder); when restoring it, also remember to restore the original permissions for the ".diagnostics" folder and its contents: i.e., essentially, root read-write, wheel read-only and everyone read-only.

Sadly, presently there seems to be no way to re-download Apple Diagnostics from Apple and reinstall it: so, if you didn't make the backup copy from your initial, out-of-the-box setup, the only option remaining is the Internet-based one, as also explained here:

http://support.apple.com/kb/HT5781

(Probably, the situation is similar also for Macs which shipped with Lion and Mountain Lion (with AHT)...)



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