Ok, so I get an "Invalid Content in Journal" when I try to repair a partition on an external drive. We has some power failures lately, so I think my external drive developed an issue. Running First Aid, Disk Utility says "Invalid Content in Journal". It says the volume is repaired, but it doesn't work. A google search leads to a couple of suggestions to disable the journal via Terminal. Edit: With the help of Leman, I updated these instructions for OS X El Capitan. This process worked for me. Good luck! The process below is based off instructions from this site: https://jkinsa.wordpress.com/2014/11/09/osx-disk-issue-invalid-content-in-journal/ With the help of Leman, I’ve updated the steps for OS X El Capitan. Open a Terminal (Applications > Utilities) Locate the Identifier for the disk (i.e. /dev/disk2s3) Prompt (Type this at the prompt in the terminal): DiskUtil list Note: If you are not sure which disk is yours, you can run diskutil with the disk unconnected and connected. Disable the journal for the current Disk Prompt: sudo /System/Library/Filesystems/hfs.fs/Contents/Resources/hfs.util -N /dev/disk5s2 Remember to use the correct Identifier for your disk Type in your password when prompted Result: Turned off the journaling bit for /dev/disk2s3 Test the disk in Disk Utility (Applications > Utilities) Highlight your volume in Disk Utility and select First Aid. After First Aid is done, click Mount. The volume shows up on your desktop! Locate the Mounted on point for the volume (i.e. /Volumes/My Book) Prompt: df Enable the journal for the volume Prompt: sudo /System/Library/Filesystems/hfs.fs/Contents/Resources/hfs.util -J /Volumes/MountedOn Remember to use your volume mount point Type in your password when prompted Result: Allocated 155648K for journal file. Test the disk in Disk Utility (Applications > Utilities) Highlight your volume in Disk Utility and select First Aid. Spend the money and buy a backup drive. You wouldn’t have needed to go through this if you could have wiped the drive and restored it from a backup!