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AIOMgr: Preparing flush failed with VERR_NOT_SUPPORTED, disabling async flushes

AIOMgr: Preparing flush failed with VERR_NOT_SUPPORTED, disabling async flushes If you get error like this while Installing Windows 8.1 as guest OS using Oracle VirtualBox /VirtualMachine Then check your RAM Allocation for the Guest OS. Example: First time i gave 5120 (5 GB) of RAM for Guest OS. while installing i got the error like this in log file AIOMgr: Preparing flush failed with VERR_NOT_SUPPORTED , disabling async flushes. Now i changed the RAM size to 4096(4 GB) , now the error gone, the guest OS installed successfully. My Suggestion is to set RAM size in EVEN  for this kind of errors.