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I am not sure what the author is demonstrating in the link at the end of the article. So he doesn't use HFS+ because corrupting a formatted disk image is not detected by Disk Utility but is detected by fsck?
I am not seriously worried about data on my disk.
On the other hand the trick he showed with the Fusion drive is quite exciting
I have some worries about the data on your disk, your HFS+ data will be in my prayers every night.