id summary reporter owner description type status component version resolution keywords cc guest host 7565 ntfs error 55 in host event log when reverting to snapshot Giulio "Win 7 ultimate x64 host Win Xp x86 guest it happens like 2 out of three times. tried both with microsoft ahci controller driver and intel one on host, same behavior. as a consequence of the error, the system partition (which in my case is the one where the virtual disk file resides) is marked dirty and chkdsk tested at next boot. no errors have been found so far." defect closed other VirtualBox 3.2.10 obsolete ntfs event id 55 error snapshot Windows Windows