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  1. #1


    Member Since
    Mar 08, 2018
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    7
    Question 2011 iMac replaced hard drive now unable to mount
    Evening all, apologies in advance for the picture heavy post but I believe that they will add value to explaining the issue that I am currently experiencing.

    I have a 2011 iMac 27" in which the original hard drive failed (not too bad after 7 years). I purchased the OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade < https://eshop.macsales.com/item/OWC/DIDIMACHDD11/ > and a Samsung 850 EVO 250GB SSD hard drive to install. I tried to SuperDuper from an another computer to it first but it failed so I progressed with the installation figuring I would be able to erase it and reinstall from Internet Recovery. Followed the guides and no problems with the physical installation.

    I've turned the computer on and upon detecting that it didn't have a startup disc with MacOS installed, it has entered macOS Utilities. I've connected it to the wifi and tried to Reinstall macOS but was unable to see the disc to instal High Sierra on:


    https://imgur.com/0SuatTy

    So I went into Disc Utility thinking I will need to Initialise the disc or some such. It shows there but is having difficulties and seems to be due to being unable to be mount disk0s2 part:

    First Aid:


    https://imgur.com/qUyPNOA


    https://imgur.com/6oRCiRa

    Partition:


    https://imgur.com/6UqBPb8

    Erase:


    https://imgur.com/uq3FpDF


    https://imgur.com/8z0j100

    This is what Disk Info shows:


    https://imgur.com/mgiWgnh


    https://imgur.com/GxqJTlS

    And Terminal diskutil list command shows:


    https://imgur.com/l4TmxhO

    Any advice for resolving? I assume I need to force mount it using some sort of Terminal command and then erase to be able to start fresh. Anyone able to please assist in advising what the command would be?

  2. #2


    Member Since
    Mar 08, 2018
    Posts
    7
    I tried entering in Terminal the following:

    diskutil unmount /dev/disk0s2

    and recieved back:

    disk0s2 was already unmounted

    so I entered:

    diskutil mount /dev/disk0s2

    and received the following error:

    Volume on disk0s2 failed to mount
    If the volume is damaged, try the "readOnly" option

    Not sure how to do readOnly option but I don't think that would allow me to erase it...

  3. #3

    ferrarr's Avatar
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    May 21, 2012
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    Specs:
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    Connect it back to the other Mac, and erase it using Disk Utility. What macOS version, is on the other Mac?
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  4. #4


    Member Since
    Mar 08, 2018
    Posts
    7
    Quote Originally Posted by ferrarr View Post
    Connect it back to the other Mac, and erase it using Disk Utility. What macOS version, is on the other Mac?
    Yeah, I can physically remove it from the iMac and use another Mac to sort it but I was hoping that would be a last resort. Given that to do that with the iMac I have to first remove the screen etc its not ideal as their is potential to damage/scratch the screen and or thin cables each time.

    All my other machines are running the latest version of High Sierra.

  5. #5

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, USA
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    Specs:
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    Then, you should be able to start the broken iMac into Target Disk Mode (TDM), https://www.howtogeek.com/214322/HOW...ILE-TRANSFERS/, then use the other Mac to install macOS.
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  6. #6


    Member Since
    Mar 08, 2018
    Posts
    7
    Thanks for the reply. Great idea that I look forward to trying when I get home later tonight. Cheers. Hopefully I have a suitable cable to connect them though...

    Also found this article, 'How to fix deep formatting problems with OS X drives' < http://www.macissues.com/2014/04/05/...h-os-x-drives/ > but I don't think that method would work as it doesn't seem to help with the mounting issue. I think the command for Terminal for this would be:

    diskutil eraseDisk JHFS+ Macintosh HD /dev/disk0"

    This is based on wanting to name the HDD to the standard 'Macintosh HD' name and that the disk is disk0 according to the diskutil list.
    Last edited by twr7cx2; 05-01-2018 at 11:39 PM.

  7. #7


    Member Since
    Mar 08, 2018
    Posts
    7
    Thanks for the replies and ideas.

    I ended up using SuperDuper app to back up my laptops HDD to a Seagate external USB3 HDD. I then plugged this into the iMac and booted off it. I was then able to use Disk Utility to Erase the HDD. At this point I could have done a fresh installation of MacOS, but instead chose to use SuperDuper to copy the external HDD to the iMacs internal so that its all set up and ready to go the way I want it. The process is currently running.

  8. #8

    MacInWin's Avatar
    Member Since
    Jan 01, 2009
    Location
    Winchester, VA
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    Specs:
    MBP 15" Mid 2015, iPhone 8, an iMac, plus ATVs, AWatch, MacMini
    Good solution. Hope it works well. It should.
    Jake

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