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"When a host system failure occurs during a virtual machine disk operation, attempting to power on the virtual machine or mount the virtual disk using the VMware Disk Mount utility causes the following error messages to appear, " Cannot open the disk... The specified virtual disk needs repair" and "Error reading volume information. Please select another disk file". There is no data lost during this process. VMware Workstation 7.1.1 fixes these issues and enables virtual machine operations to resume."(as noted in the second to the last paragraph on http://www.vmware.com/support/ws71/doc/releasenotes_ws711.html )