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. Select Disk Utility from the list and click on the Continue button. Go to the 'Startup' tab and click 'Open Task Manager' to open the Task Manager window. On the pop-up window, click the 'Services' tab, check 'Hide all Microsoft services' and tap 'Disable all'. Select the Recovery HD and click on the arrow button below the icon. Type 'MSConfig' in the search box and press Enter to open 'System Configuration'. Step 2: Type Disk Utility in the search field. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Step 1: Click on the Spotlight icon from the menu bar. But Disk Utility says (when I boot from the Lion partition) 'Disk Erase failed with the error: couldn't unmount disk'. To unmount the volume, start by accessing the disk utility. Since this is no longer necessary now that Lion does the same thing, I'd like to reformat my drive with a single partition. Now I´m unable to use the external disk, it appers on the desktop but I cannot eject it (because the computer says the disk is being used) I cannot repair it or erase it using disk utility because an error appears: unable to unmount. A long time ago I partitioned my hard drive to have a separate boot disk. I tried to use my WD 320gb disk with time machine, while the information was being recorded my lapton run out of power and shut down. lsof grep then drag the drive to the terminal window to complete the path to the drives mount point, and press enter.
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