This new file system is designed for efficiency, and it replaces the Mac OS Extended (HFS+) file system as the default on the Mac. Whatever the case, the advice given by Artem in OP's comment is wise : Work on the dd image.ġ : Finding the magic word 'NXSB' in the first few bytes (at offset 0x20) of some partition dump would be a valid indication.If your Mac has been upgraded to macOS High Sierra, you’ve probably heard about Apple’s proprietary APFS file system. (*1)ĪFAIK, Linux native support for APFS is (todate) left to proprietary drivers and self-claimed experimental *fsprogs.

If your disk is a SSD and the filesystem was created post 2018, the probability is high that mount is correct because the filesystem is actually of APFS type. However, you can easily understand that… if this assumption (fs type = hfs+) is incorrect… fiddlings will necessarily be tedious and harmful. There are some (non automatic) ways to fix that under Linux. Since mount claimed it is not of hfs+ type (deduced from the reading of the magic number) only your own knowledge can state mount is actually wrong. What could happen with this drive and how to fix it?Įither the filesystem is actually of hfs+ type and is more or less badly broken or the filesystem is not of hfs+ type. With dmesg saying hfsplus: unable to find HFS+ superblockĪttempt to fix partition says $ sudo fsck.hfsplus /dev/sdd2 Mount: /media/myhfsdrive: wrong fs type, bad option, bad superblock on /dev/sdd2, missing codepage or helper program, or other e

Partition 1 does not start on physical sector boundary.Īttempt to mount shows: # sudo mount -t hfsplus /dev/sdd2 /media/myhfsdrive Sector size (logical/physical): 512 bytes / 4096 bytes It has 2 partitions, one of which is seen under Windows Disk Management tool, which is probably precreated at the factory.ĭisk /dev/sdd: 3,7 TiB, 4000787027968 bytes, 7814037164 sectors

I have an external USB 4 TB hard drive formatted into Mac OS, which has stopped to be determined in Mac OS.

Macdrive apfs