Event ID: 57
The system failed to flush data to the transaction log. Corruption may occur.
This issue may occur if the disk is "surprise removed." For example, this behavior may occur if you remove the disk without using the Safely Remove Hardware icon in the notification area to stop the disk first. This issue may occur even though the disk uses an interface that supports surprise removal, such as a universal serial bus (USB) interface or an IEEE 1394 interface.
http://support.microsoft.com/kb/938940/en-us
