Click Run to check and repair for disk errors. Select the disk or volume you want to repair in the left sidebar, and then click First Aid at the top. Choose View and choose Show All Devices at the upper left of this app. Go to Launchpad, find Other, and then launch Disk Utility. To do First Aid again, follow these steps. When I got into Recovery Mode, I opened Disk Utility and then selected the SSD drive to run First Aid. To repair the startup volume, run First Aid from Recovery.' So I restarted my computer by holding Cmd-R options to enter Recovery mode. Here is that message from recovery mode – First Aid found corruption that needs to be repaired. There, I launch Disk Utility Repair on my startup SSD, but still, Disk Utility greets me with the same message. So, I restarted my Mac and went to Recovery Mode by press-holding Command + R. To repair the startup volume, run First Aid from Recovery. What does that mean and what is the impact on my computer. Should I be concerned that the volume could not be unmounted. Restoring the original state found as mounted. The volume Macintosh HD appears to be OK. I hope this helps someone else, as I struggled with this for a few hours. Once you have done this, you can format the entire Volume. You do this by selecting the partition in the left pane, and OPTION+CLICKING the 'Unmount' button. When you run First Aid, it scans the entire disk for errors and lets you know if there are any it can’t repair. THE EASIEST WAY TO UNMOUNT: Simply use Disk Utility to 'Force Unmount'. Disk Utility has a First Aid feature that fixes all kinds of issues related to your drives: slow performance, corrupt files, or unexpected behavior. ( error -119930868.Run First Aid to Repair Your Drive Before Erasing It. : (-69825)Īnd now I am also no longer able to mount the disk :( From within Disk Utility the error is:Ĭould not mount “disk4s2”. Wiping volume data to prevent future accidental probing failed. Tried it a second time just to see, and the error was slightly different: Newfs_hfs: write (sector 8): Input/output error But it also got stuck.įormatting disk4s2 as Mac OS Extended (Journaled) with name LaCie after that, in Disk Utility the Volume was (correctly) greyed out and I was able to start the Erase process of the device.umount didn't work ("Resource busy - try 'diskutil unmount'"), but diskutil unmount did work just fine.Thanks for the idea P.Phillips it did get me a step farther such that the erase process would actually start, but ultimately it still didn't work. The laptop from which I'm running Disk Utility is a MacBook Air (M1, 2020), using Mac OS 11.3.1.The external drive I want to erase is a LaCie "Rugged" 1 TB Firewire drive, currently with GUID partition map and formatted as Mac OS Extended (Journaled).But if I select the "Force Eject" option that does work just fine. Step 4: In the Disk-Utility app, select the disk that you want to unmount in the sidebar. Step 3: Double-click on the Disk Utility icon. Step 2: Type Disk Utility in the search field. Step 1: Click on the Spotlight icon from the menu bar. The volume on disk4 couldn’t be unmounted because it is in use by process 0 (kernel)įinal detail: unsurprisingly, ejecting the disk doesn't work. To unmount the volume, start by accessing the disk utility. Looks like this:Įrasing “LaCie Rugged FW/USB Media” (disk4) and creating “LaCie” If, instead, I select the physical device instead of just the volume then First Aid runs just fine, I get no errors.īut I am still not able to erase, because of the unmount problem, regardless of whether I've selected the physical device or just the volume. Running First Aid on “LaCieDrive” (disk4s2) If I have selected the Volume and run First Aid then I get the following: So I went to Disk Utility to run First Aid. trying to delete a file using Finder gives me an "unexpected error" (code -50) if I go to the Terminal and try "rm" then I get "Invalid argument". I cannot however rename or delete them (e.g. The drive does mount correctly, I can view files with no problems. I want to erase my external hard drive, currently full of data from an old computer's Time Machine backups, but I'm not able to.
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