![]() You can skip this and head to formatting the USB if you're just making a bootable OpenCore stick and not an installer. To start we'll want to grab ourselves a copy of macOS. While you don't need a fresh install of macOS to use OpenCore, some users prefer having a fresh slate with their boot manager upgrades. Getting started with ACPI (opens new window).Now with all of this done, head to Setting up the EFI to finish up your work.If I post the output from my mac can you give me the correct commands to run?Ģ: Apple_CoreStorage Macintosh HD 363.1 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ġ: Apple_HFS Macintosh HD +362. Recovery/transformation command (? for help): Recovery/transformation command (? for help): oĭisk size is 976773168 sectors (465.8 GiB) Partitions will be aligned on 8-sector boundaries Segments, the largest of which is 271968959 (129.7 GiB) in size. Recovery/transformation command (? for help): v I had a Windows partition before I installed El Capitan, and now I can't boot into it. I tried your method Max, and this is what I bumped into. Reboot and test your dual boot setup to verify all is working correctly. If everything checks out, write new partition table to disk and exit. If it still reports a problem, quit (q command) and start over. Now, change the name of the new partition 4 to BOOTCAMP: Changed type of partition to 'Microsoft basic data'.Hex code or GUID (L to show codes, Enter = AF00): 0700.Now, create a new partition 4 using the start and end sector values from the MBR partition 4: It only deletes gdisk's in-memory representation of the GPT). (Note: this does not delete the actual partition from disk. Most likely the start sectors will match, but the end sectors will be different. Number Start (sector) End (sector) Size Code Nameġ 40 409639 200.0 MiB EF00 EFI System PartitionĢ 409640 975693095 465.1 GiB AF00 Customerģ 975693096 976962631 619.9 MiB AB00 Recovery HDĬompare the start and end sectors for partition 4 to the MBR partition 4 start and end sectors. Recovery/transformation command (? for help): m.Next, display the GPT partition table information: Number Boot Start Sector End Sector Status Code It should show something like this:ĭisk size is 1953525168 sectors (931.5 GiB) This should be partition 4 unless you've added additional partition(s), which is not officially supported by Boot Camp. Recovery/transformation command (? for help): o.Next, display the MBR partition table and make note of the start and end sectors for your BOOTCAMP partition. Warning! Mismatched GPT and MBR partition! MBR partition 4, of type 0x07, has no corresponding GPT partition! You may continue, but this condition might cause data loss in the future! Given what you've said, it'll probably say: Then run gdisk from a terminal window and run the v (verify command). Try the following and let me know how it goes.įirst, download gdisk ( /projects/gptfdisk/files/gptfdisk/1.0.0/gdisk-binaries/gdisk-1.0.0.pkg/download) and run the installer package. No matter what I've done, I get that error now and I have no idea how to fix it without downgrading all the way to Mavericks just to be able to use GPT fdisk to repair things.īut even if I did that, the upgrade to El Capitan is what broke my W10 partition in the first place, and I don't know if I'm willing to downgrade and give up what El Cap offers on the OSX side of things, even though its broken my Windows install and ability to install outright.ĭoes anyone have any idea how to fix this issue? I found this guide but since GPT fdisk doesn't work with El Capitan, I don't know what else to do. Manually created a partition and then formatted it in the W10 install, same error. Used my now current restore of El Capitan, used Bootcamp, same error. Wiped the SSD, new install of El Capitan and then Bootcamped. ![]() I know you can use GPT fdisk to repair the GPT/MBR issues but GPT fdisk doesn't work with El Capitan and I'm not sure of any other method to repair the GPT/MBR tables so that the Windows 10 install will work. I get the "This is GPT partition style" error, and I'm not sure how to fix it under El Capitan. El Cap seems to have nuked my Bootcamp created Windows 10 partition and it won't let me install one outright. ![]()
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