If you haven’t heard already, the Mac has quite a serious security flaw in that a malicious “.dmg” disk image file will cause a kernel panic on any up-to-date Mac running 10.4.8, when you attempt to mount it.
If you are using Safari, do remember to turn off Safari’s “Open ‘safe’ files after downloading” preference to prevent disk images from mounting automatically upon download as any website you visit can initiate a download automatically.
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