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The method to repair your disk and recover the GUID partition table is related to my answers to similar questions: HFS+ invalid number of allocation blocks and Hard drive no longer accessible. Basically you have to find characteristic strings of JHFS+ volumes, use some simple math and common sense and have some luck to fix the GUID. And don't loose sight of ...


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Take a look at Time Machine, it may be keeping local snapshots. From Apple Support: Because Time Machine removes local snapshots as needed, Finder and Get Info windows don't include them in their calculations. To see how much storage space local snapshots are using, choose About This Mac from the Apple menu, then click Storage. The space used by local ...


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Connect in target mode to back up any critical files that are not backed up Boot to recovery and run Disk Utility there to repair the drive. If that fails, Boot to internet recovery and see about reinstalling the OS. Boot to internet recovery and wipe the drive and install Get hardware repair


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Since it says you need to reformat, what you need to do is: Boot into the Recovery Partition Click "Disk Utility" Select "Macintosh HD" Go to the "Erase" tab Select the format as "Mac OS Extended (Journaled)" Choose a security option from the security option section(I would recommend zero-pass since this is still your Mac) NOTE: If you have an SSD, the ...


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I actually figured it out myself. All I had to do was turn off FileVault and restart the system. Disk Utility works normally now.


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The lock switch on the card was not locked, but after locking and unlocking it (turning it off and back on) again, it worked fine. Problem solved.


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I had the same issue. I was able to fix it in an interesting way. I have been testing El Capitan on an external drive. So, I thought, why not try Disk Utility using OS 10.11.x and (after the second pass) it repaired the drive. As the Beta was on a separate disk, and the Macintosh HD was unmounted at the time, it was analyzed and repaired. Just like ...


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First of you you cannot expand a RAID-1 (Mirror). If you want to make a larger RAID array you will have to back up the drives and recreate the RAID array in a different configuration. Once you have done that you have several configuration options with 4 disks. A quick google of types of RAID will show that... However if it were me I would set up the 4 3TB ...



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