El Capitan utility disk first aid fails - unable to unmount the volume for repair

Question: Given the following error with Disk Utility first aid and success with diskutil check volume, I should consider my drive damaged or volume?

After a crash of the system on my Mac mini (end 2012) running that OS X El Capitan 10.11.3 has experienced a kernel panic induced by the adapter USB Wi - Fi, I dutifully ran first aid utility disk on each volume on the disk, in order to ensure the integrity of system files.

What I feel with disk utility (GUI) first aid:

First aid process has failed. If it is possible to backup the data on this volume.  Click OK to continue.

Check the storage system

Volume control

disk4s2: search Volume headers

disk4s2: search for disc labels

12EB36F7-A2FD-450B-AB5A-DA2D430BA3B2 group of logical volumes on 1 device

disk4s2: search the Volume metadata

Logical volume group has a Volume of metadata 24 MB with double redundancy

Start the analysis of the metadata for a valid checkpoint

Load and check the Segment headers

Load and check the payload control point

Load and check the Transaction Segment

Incorporate 0 most recent checkpoint operations of no

Load and check the virtual address Table

Load and check the use Table Segment

Load and check the Metadata Superblock

Load and check the volume logic B-trees

Logical Volume group contains 1 Logical Volume

Load and check 3D8DB35F-FA41-4A58-BA33-84A2C08FEE93

Load and check 1CD6382C-9DF5-44E6-8C66-1CDC3DE5DB8A

Load and check the summary of Freespace

Load and check the accounting of block

Load and check out virtual addresses live

New control point of transaction commit is valid

Load and check the Segment cleaning

The 12EB36F7-A2FD-450B-AB5A-DA2D430BA3B2 volume seems to be OK

Checking storage system exit code is 0

Updated support for the volume partition that

Impossible to disassemble for repair volume

Operation failed...

(underlining)

Additional information: I didn't have any problems with this disk volume. I use it only as a Time Machine backup destination. It is an encrypted volume OS X Extended (respect for case-sensitive). My concern involves only disk utility complaint that its "first aid process has failed."

After reading the complaints in other forums that utility disk on El Capitan has been "dumbed down" and can not perform many of the functions that the utility of the same name used to be able to perform in previous versions of Mac OS (complaints, I can't confirm because I'm relatively new to MacOS - although extremely in computing with Windows, UNIX and Linux) (, so I didn't get to use disk utility a lot, before El Capitan), I decided to do the same "check the volume" that I knew first aid was trying to perform with the diskutil command-line app.  Guess what? No error!:

What I have experienced with command-line diskutil:

sudo diskutil verifyvolume disk9

Audit file system began on disk9 6TBMacOS_1_Archive

Check the storage system

Volume control

disk4s2: search Volume headers

disk4s2: search for disc labels

12EB36F7-A2FD-450B-AB5A-DA2D430BA3B2 group of logical volumes on 1 device

disk4s2: search the Volume metadata

Logical volume group has a Volume of metadata 24 MB with double redundancy

Start the analysis of the metadata for a valid checkpoint

Load and check the Segment headers

Load and check the payload control point

Load and check the Transaction Segment

Incorporate 0 most recent checkpoint operations of no

Load and check the virtual address Table

Load and check the use Table Segment

Load and check the Metadata Superblock

Load and check the volume logic B-trees

Logical Volume group contains 1 Logical Volume

Load and check 3D8DB35F-FA41-4A58-BA33-84A2C08FEE93

Load and check 1CD6382C-9DF5-44E6-8C66-1CDC3DE5DB8A

Load and check the summary of Freespace

Load and check the accounting of block

Load and check out virtual addresses live

New control point of transaction commit is valid

Load and check the Segment cleaning

The 12EB36F7-A2FD-450B-AB5A-DA2D430BA3B2 volume seems to be OK

Checking storage system exit code is 0

Check the file system

Using the live mode

Perform direct verification

Logged more HFS volume control

Detected a case-sensitive volume

Checking extents overflow file

Check the extended attribute file

Checking volume bitmap

The 6TBMacOS_1_Archive volume seems to be OK

File system check exit code is 0

Finished on disk9 6TBMacOS_1_Archive file system check

I will finish success of diskutil verifyvolume that my disk volume is not serious and that Disk Utility first aid simply does not correctly?

Thank you!

-IlDavo-

I think you might be able to do a repair of first aid, after you have disassembled the drive first:

  1. Run OS X by an external device (ex: USB mode, or external hard drive or disk target from another Mac)
  2. Launch the Terminal and run the following command umount f /Volumes/ (ex: umount f/Volumes/Macintosh\ HD)
  3. Then run disk utility first aid.

I had this problem on a Macbook Air, I tried to recreate the image to work, so I didn't need to get anything off the drive. I tried to format the drive and reinstall OS X. So I don't know if first aid work after disassembly, but it worked without a doubt after that I did the first two steps above and then deleted from the disk. Not sure if this will help, but worth a try, I guess.

Tags: Mac OS & System Software

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