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I have an un-mountable external 2TB harddisk, formattet HFS+, one "usable" partition, containing a set of my backups. It won't show in Finder, it won't repair in disk utility, it won't repair on the commandline:

$ diskutil verifyVolume /dev/disk2s2
Started file system verification on disk2s2 zuhauseBackup
Verifying file system
Volume is already unmounted
Performing fsck_hfs -fn -x /dev/rdisk2s2
Journal needs to be replayed but volume is read-only
Checking Journaled HFS Plus volume
Invalid extent entry
The volume   could not be verified completely
File system check exit code is 8
Restoring the original state found as unmounted
Error: -69845: File system verify or repair failed
Underlying error: 8

$ diskutil list /dev/disk2
/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:                  Apple_HFS NameNotShown            2.0 TB     disk2s2
$

(The above NameNotShown is, in reality, shown correctly).

Linux hfsplus-fsck also give the same error as the macOS tools (it appears to be exactly the same tool):

$ sudo fsck_hfs /dev/rdisk2s2
** /dev/rdisk2s2
   Executing fsck_hfs (version hfs-522.100.5).
** Checking Journaled HFS Plus volume.
   Invalid extent entry
(4, 0)
** The volume   could not be verified completely.
$

Mounting it to a Linux PC I can see some files in the Backup-Directories, yet most "important" directories only show up as files of size 0.

The above Invalid extent entry seems to be the culprit. Any ideas how to get around this and possibly fix my volume, hopefully at least recover the files?

1 Answer 1

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Though it still cannot handle APFS, the single best 'fixit' app for HFS+ has always been DiskWarrior. idk whether they do a free trial.

Failing that, you're into 'file scavenger' apps, which are going to be poor on a drive full of hardlinks.

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  • I had already tried Micromat's TechTool 13, but that wasn't able to help. Do you think DiskWarrioer does a better job?
    – Christian
    Commented Feb 9, 2021 at 18:37
  • Yup TTP was never a patch on DW, ever (even if it used to be the Apple Genius in-house tool)
    – Tetsujin
    Commented Feb 9, 2021 at 18:41
  • +1 on DiskWarrior. It’s saved my bacon several times over the years and they deserve all my money.
    – pion
    Commented Feb 9, 2021 at 20:56
  • Very important note: Do NOT turn on or try to use your drive anymore until you are ready to recover it. Any additional access increases chances for further corruption.
    – pion
    Commented Feb 9, 2021 at 20:57

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