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I have figured out a solution to this issue. Here are the steps: Go to Apple menu > About This Mac, click on More Info and then System Report and go to Storage. Get the UUID of the volume from here (an example of a UUID is 8DD219E1-AA47-4F4C-A9DF-72BE79143B43). Open Terminal.app and enter the following: diskutil cs delete [Put Your Logical Volume ...


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Try booting from a USB drive and running Disk Utility from there on your drive, using this method in Disk Utility. You can just slide to resize the partition.


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I have been using OSX Server to do what you are attempting to do. Works pretty well over wifi network. Not a free solution and probably overkill for what you're after.


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Yes, simply click + to add a new partition. It will take space from the end of the current partition and add a new one to the end. No data will be destroyed — you can confirm this in the confirmation pane once you click Apply.


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Try to verify the HDD from disk utility and repair permission if this is doesn't work, try to format it using windows machine.


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Whilst I don't know where its stored, it is at least able to be removed by running Repair Disk in Disk Utility freeing the space for a subsequent free space erase.


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Before trashing it try this: In disk utility Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. ...


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That sound you hear is often referred to as "The Click of Death": https://en.wikipedia.org/wiki/Click_of_death Head reader errors, motor errors, anything of this sort indicate physical failure, and possibly imminent device death. Get your data backed up off of that disk NOW. Afterwards, and only afterwards, check and see if it's still in warranty. :)


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It finally seems that my MBP is incompatible with this SD card format or size. I bought a multi-cards reader, and it works. Note that the exact same behavior on a 2010 MBP.


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After plugged it all back in. Disk utility reports that one of the slices is missing from the RAID, and it shows new disk separately on the list to the left. You need to delete the missing disk from the right side screen and then click demote. From the left side, drag and drop the new disk into the right then click on the new media and click rebuild.


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Use DiskWarrior. It is exactly the purpose of the software to fix such errors. If DiskWarrior can't solve it. Use something like DataRescue to get the data, then reformat and reinstall.


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I've struggled for some days with the same problem but now it is solved. The problem was a faulty SATA cable. I've replaced it with a new one and now everything works as expected.



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