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1. #MAC USB UNABLE TO UNMOUNT VOLUME FOR REPAIR HOW TO#
2. #MAC USB UNABLE TO UNMOUNT VOLUME FOR REPAIR MAC OS#

Re-install MacOSX: click on Reinstall Mac OS X. Questions? Comments? Post them below or email us!īe sure to check us out on Twitter and the CNET Mac forums. Step 1: Insert the macOS bootable USB drive on a USB port of Mac computer. system check) operation to help you repair macOS High Sierra fail to boot error 4.

#MAC USB UNABLE TO UNMOUNT VOLUME FOR REPAIR HOW TO#

As with the diskutil command, replace the IDENTIFIER portion with the ID found in Disk Utility:Īfter one (or both) of these commands have been run, try managing the drive again in Disk Utility. How to Create macOS Bootable USB Drive on Windows Create Mac OS X. To format the drive with the diskutil command, enter the following command in the Terminal, replacing "NAME" with the desired name of the drive, and "IDENTIFIER" with the drive's ID found in Disk Utility:ĭiskutil eraseVolume HFS+ NAME IDENTIFIERĪn alternative to the "diskutil" command is the older "fdisk" command, which can be used to partition and set up the drive. Getting information on the drive itself will allow you to see the Disk Identifier which can be used in the terminal commands below Then click the "info" button and note the name of the "Disk Identifier" field. To do this, open Disk Utility and select the drive device itself. If the problem is just a matter of overcoming a default partition scheme or format incompatibility over USB connections when using Disk Utility, you can use terminal commands as alternatives to initially format the drive and hopefully allow it to be accessible via Disk Utility again.īefore running these commands, you will need to find the disk identifier for the attached USB drive device. Firewire) are able to properly format through those connections.įurthermore, people who were able to format the drive through alternative means have found the drive to start working normally, indicating a problem with how Disk Utility itself is managing specific partition setups over the USB connection. run this COMMAND in recovery mode mount -o. The problem is specific for USB connections, since those with drives that allow for alternative connections (e.g. I get the error: Cannot open access to console, the root account is locked.

Several of the hard drives in this RAID array had failed, rendering all of. This problem does not happen for all disks, and may be specific for the USB chipsets and firmware versions or settings in certain drive enclosures.įor those affected, standard troubleshooting procedures such as resetting the devices and performing SMC and PRAM resets on the computer have not helped. Connect the external drive to a USB or an eSATA port of the NAS and you can. When trying to partition and format various USB hard drives, a number of users are getting errors in Disk Utility that states "Disk Erase failed with the error: POSIX reports: The operation couldn't be completed.