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After gaining some experience with CoreStorage volumes, I reworked my first answer to generalize and facilitate it by adding some scenarios and deleting some dispensable steps. Basically there is one undocumented command to resize or expand a CoreStorage volume group and an inherent logical volume: diskutil cs resizeStack LVUUID size The command ...


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Although I don't know what specific property of HFS+ allows a user to modify the current system partition while in use; my expectation would be that operations to blocks of storage that the filesystem is not currently utilizing are allowed. Now if you tried to shrink the system partition below the current size of your system installation (the blue shaded ...


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Just let it sit - I have the same EXACT situation and while I was researching online, it just "popped up" and was available. It seemed like my good computer was trying to fix the bad computer first, before it mounted as ext hd. Hope this helps.


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I suspect Windows` chkdsk or another Microsoft tool to erroneously repairing the partition table of your device containing the EXFAT volume. The result of sudo gpt -r -vv show /dev/disk2 of my 4 TB device created in a VM and formatted with Disk Utility in comparison looks like this: gpt -r -vv show /dev/disk2 gpt show: /dev/disk2: mediasize=4000655081472; ...


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The kernel: disk3s2: I/O error is indicative of a disk going bad and you'll need to replace the disk and rebuild the disk array in order to retrieve the data. Consult the user manual for the product on how to rebuild the array so you don't loose any data.


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You can recreate the EFI System Partition (ESP) using the command-line tool gpt. Since you have to modify your current start device you need to boot to Internet Recovery Mode or an external (thumb) drive. Additionally you need a valid EFI-partition or an image file of it. Here is a similar question: How to fix broken EFI partition?. I have copied some of ...


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This Ask Different post has what you're looking for. Don't go looking for an "answer," the author for some reason decided to write his own answer in the "question" post. The method worked perfectly (and non-destructively, but you should always take a backup anyway, just in case) for me! Paraphrased: Reboot in Recovery Mode by holding down Command-R ...


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You've selected the Master Boot Record option. Only 4 primary partitions are allowed. disk2s5 and disk2s6 are actually extended partions. You cannot change the name conversion via DiskUtility. If you select GUID Partiton Table option, you'll get this: $ diskutil list disk2 /dev/disk2 #: TYPE NAME SIZE ...


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You have to boot from another device or to Internet Recovery Mode and then use the command line to modify the CoreStorage volume. Preparation: Backup your data. Detach any external drive (especially your external Time Machine backup drive). Restart to Internet Recovery Mode by pressing alt cmd R at startup. The prerequisites are the latest firmware ...



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