When doing weekly maintenance prior to weekly backup I use TTPro's E-drive to boot from and carry out this work, I have done this for several years but now I'm getting "Could not unmount volume" when attempting to check or repair the clone or the MacHD. Even Disk Utility cannot unmount the volumes. I know there is a command-line instruction for this, to find out what is open but that doesn't change the fact that this is happening when it didn't use to happen. What is causing it?
Lion OSX 10.7.5 and Snow Leopard 10.6.8 (on the E-drive)
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