Why is Mac Giving You the “Couldn’t Unmount Disk” ErrorĬan’t unmount disk on Mac usually happens when you try to do some manipulations with the external or internal drive.
You don't need things like ccleaner etc - if you do then the problems are generally much more serious than just being unable to make backups. There's a load of Geeky and complex stuff on the forums for discussing VSS - however in years of fixing Windows stuff it's generally simple and easy remedies that work. Things like GPARTED or Partition Magic should be able to re-size partitions for you easily enough. 20 GB of free space on the "C" drive or the VSS won't work. Use something like TREE SIZE FREE to check whats on your HDD and remove any not needed files and in particular see if you've got something like a Windows.old file around.ġ) The stand alone bootable version of Macrium will always work - it doesn't need the VSS facility to work.Ģ) increase the partition size of your Windows installation so there's enough free space - you will need around 40% of the estimated size of the backup FREE before VSS will work - I.e if your backup takes around 35 GB you will need to have approx. You must have sufficient (Disk) storage available or VSS won't work -that's always the difficulty of these types of backup systems that allow you to continue using Windows while taking the backup. I last created a RP perhaps three days ago, and at this juncture, don't know how to proceed to fix/repair/restore/ameliorate/whatever it is that is causing RP to fail, which, in turn may well be what is causing Reflect to also fail.Īs always, advice, solace, imprecations/and other related suggestions are hereby solicited. I tried to chase down what would fix that, to no avail. None of that helped, but eventually I found a suggestion to reduce the number of Restore Points, but when I tried to enter the Restore Point module, I received yet another error, that RP would not work, with error 0x81000203. I started to research that, which led me to a Microsoft Community entry that suggested running sfc /scannow, followed by runnning:ĭISM.exe /Online /Cleanup-image /ScanhealthĭISM.exe /Online /Cleanup-image /RestorehealthĪnd a restart. The Reflect help file has an entry for VSS Error: 0x8004231f - Failed to Create Volume Snapshot. I noticed today that my daily Reflect backups had failed for the past three days, all with the same log file errors.
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