Update: I was able to solve the problem with this solution

I want to read data from my SSD from my broken MacBook. I connected it to my Ubuntu 16.04 PC and used the command given in the third answer:

sudo mount -t hfsplus -o force,rw /dev/sdx# /media/mntpoint

which produces the following error:

wrong fs type, bad option, bad superblock on /dev/sdb2,
   missing codepage or helper program, or other error

   In some cases useful info is found in syslog - try
   dmesg | tail or so.

The syslog produces the following output:

[  294.856309] hfsplus: invalid secondary volume header
[  294.856312] hfsplus: unable to find HFS+ superblock

parted shows the file format to be hfs+:

Model: ATA APPLE SSD SM256E (scsi)
Disk /dev/sdb: 251GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number  Start   End    Size   File system  Name                  Flags
 1      20,5kB  210MB  210MB  fat32        EFI system partition  boot, esp
 2      210MB   250GB  250GB  hfs+         Macintosh HD
 3      250GB   251GB  650MB  hfs+         Recovery HD

However, fdisk shows it as Apple Core storage:

Disk /dev/sdb: 233,8 GiB, 251000193024 bytes, 490234752 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 00003592-7281-0000-4046-000013340000

Device         Start       End   Sectors   Size Type
/dev/sdb1         40    409639    409600   200M EFI System
/dev/sdb2     409640 488965175 488555536   233G Apple Core storage
/dev/sdb3  488965176 490234711   1269536 619,9M Apple boot    

Is this the cause of the problem? Any ideas how I can mount the SSD?

  • 1
    Are you sure, that your device is still using the HFS+ file system and not the new APFS file system?
    – zimmerrol
    May 30, 2017 at 16:39
  • I am not sure but parted suggests so.
    – McLawrence
    May 30, 2017 at 16:45
  • It's good you were able to solve the problem. Consider writing an answer; it would be so much better than putting the solution into the question. This is how Q&A sites work. See: Can I answer my own question?. May 30, 2017 at 19:12

1 Answer 1


The cause of the problem was that the Apple Core Storage is a Wrapper around the HFS+ Partition. This shifts the size of the actual partition slighly, so you one has to specify the partitionsize explicitly.

This procedure is described in detail in this thread

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