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Gpt partition bootable usb for mac os how to#
Gpt partition bootable usb for mac os mac os#
Gpt partition bootable usb for mac os windows 10#
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Gpt partition bootable usb for mac os windows#

\0NXSB\0\^P.) is shown in the first few bytes: you have a second full-fledged macOS boot drive you can use hexdump instead: If you had a APFS partition the string NXSB (. If you had a CoreStorage partition some non-zeros in the first 512 Bytes and the string CS (. If you had a standard partition previously the first 1024 Bytes only contain non-printable (zeros): \0\0\0\0\0\0.Īfter ~Byte 1030 you will see the following sequence: \0HFSJ\0 Vis the first 3 blocks starting with block409640 of disk0: dd if=/dev/disk0 skip=409640 count=3 | vis -c

Unmount disk0 with diskutil umountDisk disk0.

Get the partition details (below I assume the internal disk has the device identifier disk0): diskutil list To detect the former partition type boot to Internet Recovery Mode: On an SSD the default partition type would be APFS with no recovery partition. Re-formatting an HDD to APFS would have been done by the user. APFS is also possible but not recommended by Apple. The eligible partition types for an HDD are either standard HFS+ or CoreStorage (usually if the main system volume was encrypted or the Mac contains a Fusion Drive). EFI and Recovery HD have a default size on 512-disks: additional partitions created by the user e.g. The default Apple partition layout for an HDD is 1. Your lost partition(s) can be expected to be found & restored in the unallocated disk space. Your iMac contains a 2 TB non-4k disk (I suppose it's an HDD) and macOS High Sierra is (was) installed.Ģ542739416 blocks of your disk starting at block 409640 are not allocated to partitions.

Obviously the best advice was to take more care and avoid this situation!

Gpt partition bootable usb for mac os windows#

I am not bothered about losing Windows as it is a fresh install.

Gpt partition bootable usb for mac os how to#

My question is how to get the Mac partition booting again if possible, or at least get the data off. I do not believe that the mac partition has been erased, Windows is on the correct BootCamp partition.

Unfortunately, there are important un-backed up family photos etc on the Mac partition.

Gpt partition bootable usb for mac os mac os#

If I boot Mac OS from a USB, the mac partition is not shown and it is shown as "Unallocated Space" when I use Aomei in Windows 10. I have successfully reinstalled Windows but the Mac partition now doesn't show up on the "ALT" menu, reFind has disappeared and the machine now only boots into Windows. Initially this didn't work in legacy mode, so I (foolishly) decided to use EFI instead.

Gpt partition bootable usb for mac os free#

Instead of accepting my limitations and sticking with Mac OS, I decided to remove the BootCamp partition, and proceed with reinstalling Windows into the free space. Unfortunately, this rendered the Windows partition unable to boot, I got the message "Missing Operating System" on a black screen. In order to prepare for a 3rd OS, I installed reFind and resized the BootCamp partition to make space.

Gpt partition bootable usb for mac os windows 10#

I was also running Windows 10 via BootCamp. I am running macOS High Sierra on a 2011 iMac.