This one occurs every shutdown with the same details all the time:
Warning, Event 140, Ntfs (Microsoft-Windows-Ntfs) The system failed to flush data to the transaction log. Corruption may occur in VolumeId: T:, DeviceName: \Device\0000003b. (A requested read/write cannot be granted due to a conflicting file lock.)"VolumeId: T:" is the ramdisk.
This one occurs every shutdown plus at other times with different details (sometimes one line sometimes many lines):
Warning, Event 1530, User Profile Service Windows detected your registry file is still in use by other applications or services. The file will be unloaded now. The applications or services that hold your registry file may not function properly afterwards. DETAIL - 1 user registry handles leaked from \Registry\User\S-1-5-21-1243765546-3948691628-1106973369-1001: Process 272 (\Device\HarddiskVolume4\Windows\System32\svchost.exe) has opened key \REGISTRY\USER\S-1-5-21-1243765546-3948691628-1106973369-1001\Software\Microsoft\Windows\CurrentVersion\Uninstall"\Device\HarddiskVolume4\" should be the ramdisk.
The differing details all have "\Device\HarddiskVolume4\" in them.
So far the PC is running fine.
Ramdisk persistence seems to be ok, stuff seems to be saved and restored.
The ramdisk contains only browser caches of Chrome Dev, Firefox Aurora, IE10, a $RECYCLE.BIN folder and a System Volume Information folder.
OS is Windows 8 Pro x64.