If you cannot determine which files are open on the disk that you want to verify or repair, restart your computer and then mount the disk again, or start up from your Mac OS X Install DVD or CD to repair. Using Disk Utility to verify or repair disksThe Data partition reports Volume could not be unmounted.Then this: diskutil erasedisk is the ID of your disk. Unable to unmount volume for repair. Operation failed.Are you trying to erase a USB drive on your mac but getting this error as soon as you insert it?Mac Os X Unable To Unmount Volume For Repair Shop. Unmounting external drives on a Mac is usually done quick and simple by either dragging drive icon to the trash, or by using the eject symbol in a Finder window. Mounting usually happens automatically when a new drive is inserted into a USB port or SD card slot.
![]() If you plan on using the drive for Mac only then you will want to erase the disk. For more technical information see Microsoft documentation - here. This is typical and not an issue when using the drive as NTFS. It is shown as Microsoft Reserved in Disk Utility. Which is why selecting the non-indented entry is important when formatting the drive.What is that 134.2 MB volume on the drive?This volume exists because the drive is set up for Windows using GUID/ NTFS. For example Mac OS Extended (Journaled) or APFS. If you are using it for Mac only then select a format specifically for macOS. If you hover your mouse over the partition button you can see the tooltip provided by Apple.To resolve this, you must first erase the disk and set the Scheme to GUID Partition Map. The button is greyed out because the drive is set up as MBR which is typically used for drives less than 3 TB. Free 3d animation software download for macFor more technical information see Apple documentation - here.There may be other ways to resolve this issue, but the easiest way is to erase the disk and set it up with a GUID scheme. Apple requires at least 200 MB for this volume which is why this error occurs. It’s caused by Apple trying to use the 134.2 MB Microsoft Reserved volume for their EFI volume. Instructions for HFS+ formatting can be found here.Error Message - MediaKit reports not enough spaceThis error can occur when either erasing or partitioning the disk. Instructions for ExFAT formatting can be found here.If you are using this drive for macOS only, then reformat the drive Mac OS Extended (Journaled) also referred to as HFS+ for best compatibility. ![]() This error will be displayed when trying to mount the drive manually with Disk Utility.If you are using this drive between macOS and Windows, then back up any important data on the drive and reformat the drive ExFAT on macOS. An unsupported allocation unit size will keep the drive from mounting. When using a drive between macOS and Windows, drives should always be formatted on macOS because not all Windows allocation unit sizes (block sizes) are supported by macOS. Unable To Unmount Volume For Repair Install The SoftwareThis may cause the 'Allow' button to become visible in Security & Privacy.NOTE: If you are using a LaCie drive the Seagate version of Paragon will not work with your drive. If the 'Allow' button is not visible then try mounting the drive using the Paragon software to see if it provides an error message. Instructions for uninstalling Paragon can be found here. For customers using macOS 10.13 (High Sierra) or later, please make sure to 'Allow' the kernel extension during the installation process. This error may be seen when the external drive is formatted NTFS and using the Paragon driver software. If you are using the Paragon driver software then there may be an issue related to the software.To resolve this issue, try uninstalling Paragon driver software and reinstall the software. Then bring it back to your Mac and try to erase the drive again. Instructions for diskpart can be found - here.
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