Lost access to disk after reboot of Windows Server VM

Source: ask.openstack.org --- Friday, September 29, 2017
Hi, Lost access to disk after reboot of a VM running Windows Server 2012-R2 on OpenStack. I have access to the command prompt of the VM. Running `chkdsk` gives me the error: 'Errors detected in the uppercase file. Windows has checked the filesystem and found problems. Failed to transfer logged message to the event log with status 50.' Running `chkdsk /f C:` gives me the error that it cannot open volume for direct access. Can somebody please help me to troubleshoot. Not very familiar with Windows CLI. Thanks. Sana ...

from Windows http://ift.tt/2k93S51