How to Verify and Repair a Disk From the OS X Command Line

The Disk Utility application is a powerful tool for keeping the drives that are connected to your Mac happy and healthy. But there are situations in which it may not be available. As an example, connecting to a remote computer via SSH, or Disk Utility simply refusing to launch.
In this tutorial, I will show you how to:
- Find a disk that may have an error
- Verify a disk from the command line
- Repair that disk (if need be) from the command line

[@sirjcurry2182]

Thank you brother. I had spent 1 hour doing tutorials on youtube ALL FAILED. Yours worked perfectly! You are the man! Thanks again. Each one teach one. Live long and prosper. Subscribed to you.

[@kristinmichaele4372]

Thanks so much! I’m a former professional IT manager with mostly DOS experience & some Unix command line experience, now a SAHM for 14+ years. 😊 I have an early 2011 MacBook Pro on the fritz that won’t launch the MacOS Utilities. Going to try this! Thanks again!

[@jesseastl]

I have been looking for this solution for hourssssss. Great tutorial

[@jaygeeTV]

does this work even if i insert my SD but it doesn't show up on my computer?

[@Leonelbh1]

help please: when I try disk utility it says is unavailable due to being booted in single user mode

[@bilalsaraf4836]

Somehow I restored my macintosh HD drive in the disk utilities with the OS X base system and now I cannot reinstall the Mac OS or even erase and format the HD. What do I do?

[@davidarnold7818]

Hi There, I am trying your tutorial, but I get stuck here:
"DAs-Mac-Mini:Volumes DA$ cd /Volumes/
DAs-Mac-Mini:Volumes DA$ ls
D A 1 T 01 D A 1 T 02 Macintosh HD eDrive
DAs-Mac-Mini:Volumes DA$ diskutil verifyVolume D A 1 T 01
Usage: diskutil verifyVolume MountPoint|DiskIdentifier|DeviceNode
Verify the file system data structures of a volume.
Ownership of the affected disk is required."
DAs-Mac-Mini:Volumes DA$
I don't understand the "Ownership of the affected disk is required". How can I get passed this. I am the Admin.
Thank you so much!
DA

[@root-at-localhost3691]

I have a problem with a 6TB, RAID media hard drive that when I plug it in, it says that my mac cannot repair the disk and tells me to reformat. How should I solve this problem?

[@leeannfal]

This worked perfectly. Thank you!

[@nicholasyoa86]

Thanks for the video. Gonna try this later, hope this works. Looks like everyone saying it works so yeah. Thanks!

[@chrischen4661]

Error starting file system verification for disk2s1 Transcend: Invalid request (-69886)
mine came out this
how can i fix it???

[@thangasaravanan]

I got this problem when i tried my WD HDD in mac : Volume on disk2s2 failed to mount
If the volume is damaged, try the "readOnly" option ... please help me .. All important files are inside

[@AppleLoverCZ]

Same here

[@guycarter9671]

system boots to the mac os splash screen..then goes no further..Any help out there?

[@emsmacedo]

Usage: diskutil repairVolume MountPoint|DiskIdentifier|DeviceNode
Repair the file system data structures of a volume.
Ownership of the affected disk is required.
These are the massage when I try to repair my external HD, What can I do?

[@VideoAcid]

having the same issue! did you solve it??

[@jacobstienecker]

Wouldn’t
Sudo diskutil aps list
Work to list the all drives

[@a_mizani]

Thank you!

[@rilu8337]

when I type this all I get is OS X Base System :( can someone help ? no disk shows

[@fvgoya]

I hope you can help me.
I had a problem with my HDD. I tried using the Disk Utility to repair my external Disk. But every time I have a error saying that the Disk can not be repair.
I tried the way that you did in this vídeo. But I have this message
MacBook-Pro-Me-8:Volumes Me$ diskutil repairvolume /Volumes/ 1.5 TB
Usage: diskutil repairVolume MountPoint|DiskIdentifier|DeviceNode
Repair the file system data structures of a volume.
Ownership of the affected disk is required.
MacBook-Pro-Me-8:Volumes Me$
Do you have any ideia how i can fix this without using any recovery program?
Thank you!!

[@VideoAcid]

did you solve this??

[@pixelpatricio932]

macbook-de-sandra-garces:~ sandragarces$ diskutil partitionDisk /dev/disk1 GPT JHFS+ First 8.0g
Started partitioning on disk1
Unmounting disk
It's hours there and it does not do anything else

[@randy4658]

My disk doesn't even show up in the volume folder but yet it shows up in the disk utility and in /dev/disk2

[@AppleLoverCZ]

Same here

[@jay-armaravilla2048]

Please help “Error: - 69673: Unable to unmount volume for repair”

[@reysnaps6515]

Same here

[@guycarter9671]

I have tried everything that I can...nothingworks

[@fridakalota370]

nope it didnt work on mine it asked me about OWNERSHIP of the affected disk is required

[@VideoAcid]

please tell me you found a solution! having same problem!

[@imjeremaih]

Nice Reverb

[@martinb5367]

Ownership of the affected disk is required

[@kevinbartlett4951]

Minor error: you said "backslash" in your intro when you meant a forward slash.

[@Carizonder]

TOSHIBA MK2553GSK Media

[@edithbonazzacadenas3218]

Use english not computer language