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Andres's answer is good (Thank you!), and if the first attempt to repair doesn't work, you might have to run it a few times: verify repair verify repair and yes then it did reappear from 'greyed' to 'colour' disk on the side panel. For me to see it mounted, I had to unmount it, pull the USB out and replug it back in.


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I experienced this exact problem yesterday. I fixed it by putting the ntfs drive onto a PC and searching for the files. They had all just been moved, not deleted--very strange. Also, running a disk error check in windows after to clean up any straggling issues.


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I've had good experience fixing volumes (even when disk utility says it can't fix it) using Diskwarrior and/or TechTool Pro. Both of them are shareware, there might be freeware alternatives but I don't have experience with any.


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I had luck with fsck on the command line using slightly different options from above. Used df -hl to determine the path of the disk device as above (in my case my first external USB drive, /dev/disk1s1) Then use sudo fsck_hfs -r -d /dev/disk1s1 The -r option rebuilds the Catalog B-Tree. Not sure why disk utility doesn't do this automatically. The -d ...


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Go to Disk Utility, select the disk on the left, go to the Erase tab, specify the format as FAT32, enter a name and click Erase.


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Wasn't exactly feeling like modifying the GPT table via the terminal with all my data on the disk, so I just completely erase the disk after backing up my data and reinstall OS X booting on a USB stick with Mavericks on it : Everything is back to normal :)


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Thanks for the suggestions and answers. As you all suggested there is no way to do this using disk utility, Seems need to have some 3rd party software. Only way to achieve something similar to above using Disk Utility is: According to image attached above, I had to move all data from "Software" partition to somewhere else and delete "Software" partition ...


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Disk Utility can't do it, but iPartition can - http://www.coriolis-systems.com/iPartition.php Tested on both GUID & MBR formatted drives.


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This requires the three partitions between the selected one and the intended one to be moved. Disk Utility can't do this without destructively destroying and recreating the partitions in the intended location, removing all data from the partitions. You will need third-party software such as iPartition. For more information, see Partitioning Software.


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The biggest issue here is that you need to run your analysis tools as root. If you don't do this, you'll only see the files that your account has access to, and so you won't see everything that is taking up space. I like GrandPerspective personally. If it's in your Applications folder, the command to run it as root looks like this: sudo ...


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I know this is an old article, but this recently happened to me and the easiest way to get rid of the Yosemite partition is to: Boot your other OS, mine was Mavericks Open Disk Utility Select the Yosemite partition Select the erase tab, erase it, Select the main drive and go to the partition tab, where you can then delete the Yosemite partition and resize ...


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I found out that my problem was due to a failing sata cable. Since I have replaced it, I do not have this problem anymore.


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Not sure if this fix will universally fix the error I ran into, but thought I should share what worked for me. Try to "Verify" the partition I was going to resize. If you issue is the same as mine, this will fail and ask you to "Repair" the partition. Repairing the partition will not work until you boot from your recovery partition, so reboot and hit the ...


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If your end goal is to repartition, given that you can't in OSX, I'd try a linux livecd using gparted. Something like this: gparted tutorial You can boot your mac with a linux live USB key and use gparted to repartition, then boot back into OSX.


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If your partition turned into Logical Volume Group (you can't resize or delete Yosemite partition), you can revert partition type with few command line. Open Terminal type "diskutil corestorage list" Find Yosemite partition UUID string. type "diskutil corestorage revert " Your Yosemite partition is now revert to default partition type. Now, you can resize ...



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