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I ran the command cat /dev/random > /dev/disk2 as user "su" and all partitions are gone now. At first, the available disk space was still only 801GB. After a while it showed up properly in Disk Utility as 3.0TB though and I was able to reformat it. Excellent! Thanks to Topher Kessler for posting the proper commands in How to fix deep formatting problems ...


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The following diskutil cs resizeStack command is vastly undocumented and as such potentially destructive. There might be an easy way outlined first and a long winding, time consuming hard way. Please backup your Mac OS X before proceeding. The not-as-long-as-expected way: A 2nd computer or an iPhone with the stackexchange credentials to enter the site ...


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I don't think so. I put together a Fusion Drive as an experiment to see if was preferable to using a pure SSD vs. a high speed drive, and the trade offs, namely size vs. performance. With my Fusion, the SSD was on the inside of the unit and I was using a Firewire external drive. The nice thing was that when the Firewire's drive activity light flashed, I ...


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On Yosemite you can use the command 'diskutil cs info' and the corestorage UUID as a parameter. There will be a line in the output table that shows "Fusion:". On my core storage volume it showed "NO". I have a 2011 iMac. Sure enough, performance led me to investigate this and all the test scripts and commands I found show that it was not a true Fusion ...



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