Reverting to release notes that make haiku seem wordy, Apple has released something called OS X Mountain Lion 10.8.2 Supplemental Update 2.0 that claims to address “an issue with Keychain that can affect 2012 Mac systems.” It’s recommended for all Macs introduced in 2012, but there’s nothing else that hints at what it fixes or how serious the “issue” might be. It’s available via the App Store’s Updates screen, and if it doesn’t appear for you, it’s presumably not necessary for your Mac. (Free, 26.65 MB)
Copy Disk Image as Folder
When you open a .dmg file, a disk image is mounted. You are then generally supposed to copy the contents of that disk image to your hard drive (to your Desktop, your Applications folder, or wherever). But what if you want to copy the whole disk image, including all its contents, as a folder? Hold the Option key, and drag the "proxy icon" in the title bar of the disk image window to the destination in the Finder.
OS X Mountain Lion 10.8.2 Supplemental Update 2.0
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